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 Page 1


 
  
NTSE STAGE – I (DELHI STATE)  
05 – A (2019 – 20)  
 (For Class – X) 
MENTAL ABILITY TEST (MAT) 
HINTS & SOLUTIONS 
 
1. 2 
1. Positive factors of 256 are  
 1, 2, 4, 8, 16, 32, 64, 128, 256 
 ? 
? ?
? ?
? ?
? ?
n 9
a r 1 1 2 1
sq
r 1 2 1
? ?
? ?
? ?
[where a = 1, and r = 2, and n = 9]  
 ? Sq = 511 
 
2. 4 
2. 
? ?
? ?
? ?
2
2
X X 1 1
X X 1 1
X1 X XX1 XX1
? ? ?
?
? ? ?
? ? ?
 
 = 
? ? ? ?
? ?
? ?
2 2 2
2X X 1
XX1 2X 1 2X 2X
XX 1 XX 1 X X 1
?
? ? ? ? ?
? ?
? ? ?
 
 = 2 
 
3. 1 
3. 5 + 6 + 7 + … + 19 
 Here a = 5, d = 1 and n = 15 
 ? S
n
 = ? ?
n
2a n 1 d
2
? ? ? ?
? ?
 
 ? ?
15
15 15
S 10 14 1 24
2 2
? ? ? ? ? 
 = 15 x 12 = 180 
 
4. 1 
4. 
1 2 3
: : 6:8:9
2 3 4
? 
 Let numbers be 6x, 8x and 9x 
 ? 9x – 6x = 27 
 ? x = 9 
 ? Numbers are 54, 72, 81 
 
5. 2 or 4 
5. 
? ?
25 26 27 28 25 0 1 2 3
3333 3 3 3 3 3 ??? ? ? ? ? 
 = ? ?
25
3 1 3 9 27 ? ? ? 
 = 
25 23
3 40 3 958 ? ? ? ? ? 
 = 
25 23
3 40 3 8 45 ? ? ? ? 
  
6. 4 
6. Rohan’s final score = 
90 2 75 1
3
? ? ?
 
 = 85 
 
Page 2


 
  
NTSE STAGE – I (DELHI STATE)  
05 – A (2019 – 20)  
 (For Class – X) 
MENTAL ABILITY TEST (MAT) 
HINTS & SOLUTIONS 
 
1. 2 
1. Positive factors of 256 are  
 1, 2, 4, 8, 16, 32, 64, 128, 256 
 ? 
? ?
? ?
? ?
? ?
n 9
a r 1 1 2 1
sq
r 1 2 1
? ?
? ?
? ?
[where a = 1, and r = 2, and n = 9]  
 ? Sq = 511 
 
2. 4 
2. 
? ?
? ?
? ?
2
2
X X 1 1
X X 1 1
X1 X XX1 XX1
? ? ?
?
? ? ?
? ? ?
 
 = 
? ? ? ?
? ?
? ?
2 2 2
2X X 1
XX1 2X 1 2X 2X
XX 1 XX 1 X X 1
?
? ? ? ? ?
? ?
? ? ?
 
 = 2 
 
3. 1 
3. 5 + 6 + 7 + … + 19 
 Here a = 5, d = 1 and n = 15 
 ? S
n
 = ? ?
n
2a n 1 d
2
? ? ? ?
? ?
 
 ? ?
15
15 15
S 10 14 1 24
2 2
? ? ? ? ? 
 = 15 x 12 = 180 
 
4. 1 
4. 
1 2 3
: : 6:8:9
2 3 4
? 
 Let numbers be 6x, 8x and 9x 
 ? 9x – 6x = 27 
 ? x = 9 
 ? Numbers are 54, 72, 81 
 
5. 2 or 4 
5. 
? ?
25 26 27 28 25 0 1 2 3
3333 3 3 3 3 3 ??? ? ? ? ? 
 = ? ?
25
3 1 3 9 27 ? ? ? 
 = 
25 23
3 40 3 958 ? ? ? ? ? 
 = 
25 23
3 40 3 8 45 ? ? ? ? 
  
6. 4 
6. Rohan’s final score = 
90 2 75 1
3
? ? ?
 
 = 85 
 
 
  
7. 1 
7. Let Grand mother = G, mother = M and daughter = D 
 ? Possible ways = GMD 
 GDM 
 MGD 
 MDG 
 DGM 
 DMG 
 
8. 2 
8. Let at time of marriage man’s age = x years  
 And man’s wife’s age = y years  
 ? x = y + 6 ….(1) 
 And ? ? ? ?
6
x12 y12
5
? ? ? 
 = 5x + 60 = 6y + 72 
 = 5x – 6y = 12 …(2) 
 Solving both equations we got x = 24 and y = 18 
 
9. 3 
9. P (number is even) = 
1
2
 
 P (number is less than 4) = 
1
2
 
 P (number is even and less than 4) = 
1
6
 
 ? 
? ?
? ?
P number is even and less than 4
number is less than 4
P
number is even P number is even
? ?
?
? ?
? ?
= 
1
1
6
1
3
2
? 
 
10. 2 
10. 10 balls ? 5B and 5W 
 After removing 1 B balls, total balls left = 9 and  
 Total black balls left = 4 
 ? P (B ball after removing 1
st
 B ball) = 
4
9
 
 
11. 2 
11. 10 – 3 = 12 ? 10 – 3 + 5 = 12 
 12 – 4 = 13 ? 12 – 4 + 5 = 13 
 14 – 5 = 14 ? 14 – 5 + 5 = 14 
 16 – 6 = ? ? 16 – 6 + 5 = 15  
 
12. 2 
12. If bus does not stops, then it will travel 9 km more with 54 kmph 
 ? It will stop for 
9 9
hr 60
54 54
? ? min 
 = 10 min  
 
 
13. 4 
Page 3


 
  
NTSE STAGE – I (DELHI STATE)  
05 – A (2019 – 20)  
 (For Class – X) 
MENTAL ABILITY TEST (MAT) 
HINTS & SOLUTIONS 
 
1. 2 
1. Positive factors of 256 are  
 1, 2, 4, 8, 16, 32, 64, 128, 256 
 ? 
? ?
? ?
? ?
? ?
n 9
a r 1 1 2 1
sq
r 1 2 1
? ?
? ?
? ?
[where a = 1, and r = 2, and n = 9]  
 ? Sq = 511 
 
2. 4 
2. 
? ?
? ?
? ?
2
2
X X 1 1
X X 1 1
X1 X XX1 XX1
? ? ?
?
? ? ?
? ? ?
 
 = 
? ? ? ?
? ?
? ?
2 2 2
2X X 1
XX1 2X 1 2X 2X
XX 1 XX 1 X X 1
?
? ? ? ? ?
? ?
? ? ?
 
 = 2 
 
3. 1 
3. 5 + 6 + 7 + … + 19 
 Here a = 5, d = 1 and n = 15 
 ? S
n
 = ? ?
n
2a n 1 d
2
? ? ? ?
? ?
 
 ? ?
15
15 15
S 10 14 1 24
2 2
? ? ? ? ? 
 = 15 x 12 = 180 
 
4. 1 
4. 
1 2 3
: : 6:8:9
2 3 4
? 
 Let numbers be 6x, 8x and 9x 
 ? 9x – 6x = 27 
 ? x = 9 
 ? Numbers are 54, 72, 81 
 
5. 2 or 4 
5. 
? ?
25 26 27 28 25 0 1 2 3
3333 3 3 3 3 3 ??? ? ? ? ? 
 = ? ?
25
3 1 3 9 27 ? ? ? 
 = 
25 23
3 40 3 958 ? ? ? ? ? 
 = 
25 23
3 40 3 8 45 ? ? ? ? 
  
6. 4 
6. Rohan’s final score = 
90 2 75 1
3
? ? ?
 
 = 85 
 
 
  
7. 1 
7. Let Grand mother = G, mother = M and daughter = D 
 ? Possible ways = GMD 
 GDM 
 MGD 
 MDG 
 DGM 
 DMG 
 
8. 2 
8. Let at time of marriage man’s age = x years  
 And man’s wife’s age = y years  
 ? x = y + 6 ….(1) 
 And ? ? ? ?
6
x12 y12
5
? ? ? 
 = 5x + 60 = 6y + 72 
 = 5x – 6y = 12 …(2) 
 Solving both equations we got x = 24 and y = 18 
 
9. 3 
9. P (number is even) = 
1
2
 
 P (number is less than 4) = 
1
2
 
 P (number is even and less than 4) = 
1
6
 
 ? 
? ?
? ?
P number is even and less than 4
number is less than 4
P
number is even P number is even
? ?
?
? ?
? ?
= 
1
1
6
1
3
2
? 
 
10. 2 
10. 10 balls ? 5B and 5W 
 After removing 1 B balls, total balls left = 9 and  
 Total black balls left = 4 
 ? P (B ball after removing 1
st
 B ball) = 
4
9
 
 
11. 2 
11. 10 – 3 = 12 ? 10 – 3 + 5 = 12 
 12 – 4 = 13 ? 12 – 4 + 5 = 13 
 14 – 5 = 14 ? 14 – 5 + 5 = 14 
 16 – 6 = ? ? 16 – 6 + 5 = 15  
 
12. 2 
12. If bus does not stops, then it will travel 9 km more with 54 kmph 
 ? It will stop for 
9 9
hr 60
54 54
? ? min 
 = 10 min  
 
 
13. 4 
 
  
13. 
40 1620 30 960 x 5200
100 100 100
? ? ?
? ? 
 ? 
40 1620 30 960
x
5200
? ? ?
? 
 ? x = 18 
 
14. 2 
14. Between 1
st
 and 25
th
 tree there are 24 gap & let say each gap is of x m distance. 
 ? 24 x = 30 
 
30
x
24
? 
 Now between 3
rd
 & 15
th
 tree there are 12 gaps 
 ? Distance between 3
rd
 & 15
th
 tree 
30
12 15 m
24
? ? ? 
 
15. 4 
15. Time 8 8:30 9 9:30 10 10:30 11 11:30 12 12:30 1 1:30 
 Bell 3 1 1 1 3 3 1 1 1 1 1 3 
 ? Bell rung 20 times. 
 
16. 4 
16. 
80A 50B
100 100
? 
 or 
B 8
A 5
? 
 Now 
x A B
B x 100
100 A
?
? ? ? ? 
 
8
x 100 160
5
? ? ? ? 
 
17. 3 
17. Let numbers = (x – 2), (x – 1), (x + 1), (x + 2) 
 
? ? ? ? ? ? ? ? x2 x 1 x x 1 x2
7
5
? ?? ? ?? ??
? ? 
 
5x
7
5
? ? 
 ? x = 7 
 ? highest number = 9 
 
18. 2 
18. ? ? ? ?
33 3 22 2
xy z 3xyz x y z xy z xy yz zx ?? ? ? ? ? ?? ??? 
 Now we know that, ? ? ? ?
2
2 2 2
x yz x y z 2xy yzzx ? ? ??? ? ?? 
 
15 15 51
xy yz zx 87
2
? ?
? ? ? ? ? 
 ? ?
333
x y z 3xyz 15 51 87 ? ? ? ? ? ? 
    = 15 × ( ?36) 
    = ?540 
 
19. 4 
19. Let sides = 3x, 4x & 5x cm 
Page 4


 
  
NTSE STAGE – I (DELHI STATE)  
05 – A (2019 – 20)  
 (For Class – X) 
MENTAL ABILITY TEST (MAT) 
HINTS & SOLUTIONS 
 
1. 2 
1. Positive factors of 256 are  
 1, 2, 4, 8, 16, 32, 64, 128, 256 
 ? 
? ?
? ?
? ?
? ?
n 9
a r 1 1 2 1
sq
r 1 2 1
? ?
? ?
? ?
[where a = 1, and r = 2, and n = 9]  
 ? Sq = 511 
 
2. 4 
2. 
? ?
? ?
? ?
2
2
X X 1 1
X X 1 1
X1 X XX1 XX1
? ? ?
?
? ? ?
? ? ?
 
 = 
? ? ? ?
? ?
? ?
2 2 2
2X X 1
XX1 2X 1 2X 2X
XX 1 XX 1 X X 1
?
? ? ? ? ?
? ?
? ? ?
 
 = 2 
 
3. 1 
3. 5 + 6 + 7 + … + 19 
 Here a = 5, d = 1 and n = 15 
 ? S
n
 = ? ?
n
2a n 1 d
2
? ? ? ?
? ?
 
 ? ?
15
15 15
S 10 14 1 24
2 2
? ? ? ? ? 
 = 15 x 12 = 180 
 
4. 1 
4. 
1 2 3
: : 6:8:9
2 3 4
? 
 Let numbers be 6x, 8x and 9x 
 ? 9x – 6x = 27 
 ? x = 9 
 ? Numbers are 54, 72, 81 
 
5. 2 or 4 
5. 
? ?
25 26 27 28 25 0 1 2 3
3333 3 3 3 3 3 ??? ? ? ? ? 
 = ? ?
25
3 1 3 9 27 ? ? ? 
 = 
25 23
3 40 3 958 ? ? ? ? ? 
 = 
25 23
3 40 3 8 45 ? ? ? ? 
  
6. 4 
6. Rohan’s final score = 
90 2 75 1
3
? ? ?
 
 = 85 
 
 
  
7. 1 
7. Let Grand mother = G, mother = M and daughter = D 
 ? Possible ways = GMD 
 GDM 
 MGD 
 MDG 
 DGM 
 DMG 
 
8. 2 
8. Let at time of marriage man’s age = x years  
 And man’s wife’s age = y years  
 ? x = y + 6 ….(1) 
 And ? ? ? ?
6
x12 y12
5
? ? ? 
 = 5x + 60 = 6y + 72 
 = 5x – 6y = 12 …(2) 
 Solving both equations we got x = 24 and y = 18 
 
9. 3 
9. P (number is even) = 
1
2
 
 P (number is less than 4) = 
1
2
 
 P (number is even and less than 4) = 
1
6
 
 ? 
? ?
? ?
P number is even and less than 4
number is less than 4
P
number is even P number is even
? ?
?
? ?
? ?
= 
1
1
6
1
3
2
? 
 
10. 2 
10. 10 balls ? 5B and 5W 
 After removing 1 B balls, total balls left = 9 and  
 Total black balls left = 4 
 ? P (B ball after removing 1
st
 B ball) = 
4
9
 
 
11. 2 
11. 10 – 3 = 12 ? 10 – 3 + 5 = 12 
 12 – 4 = 13 ? 12 – 4 + 5 = 13 
 14 – 5 = 14 ? 14 – 5 + 5 = 14 
 16 – 6 = ? ? 16 – 6 + 5 = 15  
 
12. 2 
12. If bus does not stops, then it will travel 9 km more with 54 kmph 
 ? It will stop for 
9 9
hr 60
54 54
? ? min 
 = 10 min  
 
 
13. 4 
 
  
13. 
40 1620 30 960 x 5200
100 100 100
? ? ?
? ? 
 ? 
40 1620 30 960
x
5200
? ? ?
? 
 ? x = 18 
 
14. 2 
14. Between 1
st
 and 25
th
 tree there are 24 gap & let say each gap is of x m distance. 
 ? 24 x = 30 
 
30
x
24
? 
 Now between 3
rd
 & 15
th
 tree there are 12 gaps 
 ? Distance between 3
rd
 & 15
th
 tree 
30
12 15 m
24
? ? ? 
 
15. 4 
15. Time 8 8:30 9 9:30 10 10:30 11 11:30 12 12:30 1 1:30 
 Bell 3 1 1 1 3 3 1 1 1 1 1 3 
 ? Bell rung 20 times. 
 
16. 4 
16. 
80A 50B
100 100
? 
 or 
B 8
A 5
? 
 Now 
x A B
B x 100
100 A
?
? ? ? ? 
 
8
x 100 160
5
? ? ? ? 
 
17. 3 
17. Let numbers = (x – 2), (x – 1), (x + 1), (x + 2) 
 
? ? ? ? ? ? ? ? x2 x 1 x x 1 x2
7
5
? ?? ? ?? ??
? ? 
 
5x
7
5
? ? 
 ? x = 7 
 ? highest number = 9 
 
18. 2 
18. ? ? ? ?
33 3 22 2
xy z 3xyz x y z xy z xy yz zx ?? ? ? ? ? ?? ??? 
 Now we know that, ? ? ? ?
2
2 2 2
x yz x y z 2xy yzzx ? ? ??? ? ?? 
 
15 15 51
xy yz zx 87
2
? ?
? ? ? ? ? 
 ? ?
333
x y z 3xyz 15 51 87 ? ? ? ? ? ? 
    = 15 × ( ?36) 
    = ?540 
 
19. 4 
19. Let sides = 3x, 4x & 5x cm 
 
  
 
3x 4x 5x
S 6 x
2
? ?
? ? ? 
 ? ? ? ? ? ? Area S S a S b S c ? ? ??? 
 384 6x 3x 2x x ? ??? 
 384 = 6x
2
 
 ? x = 8 
 ? P = 12 x = 12 × 8 = 96 cm 
 
20. 3 
20. (1) 
1 1 17
1 16
66
3 3
17
17
16
? ?
? ?
 
 (2) 
1 1 1 17
1 1 60
60
3 3
1 17
17
1
9
9
8
? ? ?
? ?
?
 
 (3) 
1 1 1 13
1 1 48
48
3 3
1 13
13
1
9
9
4
? ? ?
? ?
?
 
 (4) 
1 1 8
1 35
35
3
9
8
8
? ?
?
 
 
21. 3 
21. a $ b = a × (a + b) 
 ? (2 $ 0) $ 1 = [2 × (2 + 0)] $ 1 
   = 4 $ 1 
   = 4 × (4 + 1) 
   = 20 
 
22. 2 
22.  
B C 
E 
D 
A 
8 
8 
10
12 
6 
 
 Construction: Draw DE ? BC 
 ? Area of ABCD = Area of rec ABED + Area of ?DEC 
    
1
b b h
2
?? ? ?? ? 
    
1
8 12 6 8
2
? ? ? ? ? 
    = 96 + 24 = 120 m
2
 
 
23. 3 
Page 5


 
  
NTSE STAGE – I (DELHI STATE)  
05 – A (2019 – 20)  
 (For Class – X) 
MENTAL ABILITY TEST (MAT) 
HINTS & SOLUTIONS 
 
1. 2 
1. Positive factors of 256 are  
 1, 2, 4, 8, 16, 32, 64, 128, 256 
 ? 
? ?
? ?
? ?
? ?
n 9
a r 1 1 2 1
sq
r 1 2 1
? ?
? ?
? ?
[where a = 1, and r = 2, and n = 9]  
 ? Sq = 511 
 
2. 4 
2. 
? ?
? ?
? ?
2
2
X X 1 1
X X 1 1
X1 X XX1 XX1
? ? ?
?
? ? ?
? ? ?
 
 = 
? ? ? ?
? ?
? ?
2 2 2
2X X 1
XX1 2X 1 2X 2X
XX 1 XX 1 X X 1
?
? ? ? ? ?
? ?
? ? ?
 
 = 2 
 
3. 1 
3. 5 + 6 + 7 + … + 19 
 Here a = 5, d = 1 and n = 15 
 ? S
n
 = ? ?
n
2a n 1 d
2
? ? ? ?
? ?
 
 ? ?
15
15 15
S 10 14 1 24
2 2
? ? ? ? ? 
 = 15 x 12 = 180 
 
4. 1 
4. 
1 2 3
: : 6:8:9
2 3 4
? 
 Let numbers be 6x, 8x and 9x 
 ? 9x – 6x = 27 
 ? x = 9 
 ? Numbers are 54, 72, 81 
 
5. 2 or 4 
5. 
? ?
25 26 27 28 25 0 1 2 3
3333 3 3 3 3 3 ??? ? ? ? ? 
 = ? ?
25
3 1 3 9 27 ? ? ? 
 = 
25 23
3 40 3 958 ? ? ? ? ? 
 = 
25 23
3 40 3 8 45 ? ? ? ? 
  
6. 4 
6. Rohan’s final score = 
90 2 75 1
3
? ? ?
 
 = 85 
 
 
  
7. 1 
7. Let Grand mother = G, mother = M and daughter = D 
 ? Possible ways = GMD 
 GDM 
 MGD 
 MDG 
 DGM 
 DMG 
 
8. 2 
8. Let at time of marriage man’s age = x years  
 And man’s wife’s age = y years  
 ? x = y + 6 ….(1) 
 And ? ? ? ?
6
x12 y12
5
? ? ? 
 = 5x + 60 = 6y + 72 
 = 5x – 6y = 12 …(2) 
 Solving both equations we got x = 24 and y = 18 
 
9. 3 
9. P (number is even) = 
1
2
 
 P (number is less than 4) = 
1
2
 
 P (number is even and less than 4) = 
1
6
 
 ? 
? ?
? ?
P number is even and less than 4
number is less than 4
P
number is even P number is even
? ?
?
? ?
? ?
= 
1
1
6
1
3
2
? 
 
10. 2 
10. 10 balls ? 5B and 5W 
 After removing 1 B balls, total balls left = 9 and  
 Total black balls left = 4 
 ? P (B ball after removing 1
st
 B ball) = 
4
9
 
 
11. 2 
11. 10 – 3 = 12 ? 10 – 3 + 5 = 12 
 12 – 4 = 13 ? 12 – 4 + 5 = 13 
 14 – 5 = 14 ? 14 – 5 + 5 = 14 
 16 – 6 = ? ? 16 – 6 + 5 = 15  
 
12. 2 
12. If bus does not stops, then it will travel 9 km more with 54 kmph 
 ? It will stop for 
9 9
hr 60
54 54
? ? min 
 = 10 min  
 
 
13. 4 
 
  
13. 
40 1620 30 960 x 5200
100 100 100
? ? ?
? ? 
 ? 
40 1620 30 960
x
5200
? ? ?
? 
 ? x = 18 
 
14. 2 
14. Between 1
st
 and 25
th
 tree there are 24 gap & let say each gap is of x m distance. 
 ? 24 x = 30 
 
30
x
24
? 
 Now between 3
rd
 & 15
th
 tree there are 12 gaps 
 ? Distance between 3
rd
 & 15
th
 tree 
30
12 15 m
24
? ? ? 
 
15. 4 
15. Time 8 8:30 9 9:30 10 10:30 11 11:30 12 12:30 1 1:30 
 Bell 3 1 1 1 3 3 1 1 1 1 1 3 
 ? Bell rung 20 times. 
 
16. 4 
16. 
80A 50B
100 100
? 
 or 
B 8
A 5
? 
 Now 
x A B
B x 100
100 A
?
? ? ? ? 
 
8
x 100 160
5
? ? ? ? 
 
17. 3 
17. Let numbers = (x – 2), (x – 1), (x + 1), (x + 2) 
 
? ? ? ? ? ? ? ? x2 x 1 x x 1 x2
7
5
? ?? ? ?? ??
? ? 
 
5x
7
5
? ? 
 ? x = 7 
 ? highest number = 9 
 
18. 2 
18. ? ? ? ?
33 3 22 2
xy z 3xyz x y z xy z xy yz zx ?? ? ? ? ? ?? ??? 
 Now we know that, ? ? ? ?
2
2 2 2
x yz x y z 2xy yzzx ? ? ??? ? ?? 
 
15 15 51
xy yz zx 87
2
? ?
? ? ? ? ? 
 ? ?
333
x y z 3xyz 15 51 87 ? ? ? ? ? ? 
    = 15 × ( ?36) 
    = ?540 
 
19. 4 
19. Let sides = 3x, 4x & 5x cm 
 
  
 
3x 4x 5x
S 6 x
2
? ?
? ? ? 
 ? ? ? ? ? ? Area S S a S b S c ? ? ??? 
 384 6x 3x 2x x ? ??? 
 384 = 6x
2
 
 ? x = 8 
 ? P = 12 x = 12 × 8 = 96 cm 
 
20. 3 
20. (1) 
1 1 17
1 16
66
3 3
17
17
16
? ?
? ?
 
 (2) 
1 1 1 17
1 1 60
60
3 3
1 17
17
1
9
9
8
? ? ?
? ?
?
 
 (3) 
1 1 1 13
1 1 48
48
3 3
1 13
13
1
9
9
4
? ? ?
? ?
?
 
 (4) 
1 1 8
1 35
35
3
9
8
8
? ?
?
 
 
21. 3 
21. a $ b = a × (a + b) 
 ? (2 $ 0) $ 1 = [2 × (2 + 0)] $ 1 
   = 4 $ 1 
   = 4 × (4 + 1) 
   = 20 
 
22. 2 
22.  
B C 
E 
D 
A 
8 
8 
10
12 
6 
 
 Construction: Draw DE ? BC 
 ? Area of ABCD = Area of rec ABED + Area of ?DEC 
    
1
b b h
2
?? ? ?? ? 
    
1
8 12 6 8
2
? ? ? ? ? 
    = 96 + 24 = 120 m
2
 
 
23. 3 
 
  
23.  4, 8, 28, 80, 244 
× 3 – 4 × 3 + 4 × 3 – 4 × 3 + 4 
 
 
24. 2 
24.  4, 7, 12, 19, 28, 
+3 +5 +7 +9 
39 52 
+11 +13 
 
 
25. 4 
25.  10080, 1680, 336, 84, 28, 
? 6 ? 5 ? 4 ? 3
14 
? 2 
 
 
26. 2 
26. 
n
r
CI P 1 1
100
? ?
? ?
? ? ? ? ?
? ?
? ?
? ?
? ?
 
 
n
7
4347 30000 1 1
100
? ?
? ?
? ? ? ? ?
? ?
? ?
? ?
? ?
 
 
n
11490 107
10000 100
? ?
? ?
? ?
? ?
 
 
2 n
107 107
100 100
?? ??
? ?
?? ??
?? ??
 
 ? n = 2 
 
27. 2 
27. 
1 1 1 1
3 5 2 4
2,9,16 ,32 
 = 
1 1
3 2
2,9,2
1
 , 2
1
 
 
6 6
6 6
3 2
2 ,9 ,2 ,2 ? 
 = 2
3
, 9
2
, 2
6
, 2
6
 
 
28. 3 
28. 
1
x 2
x
? ? 
 ? x
2
 
+ 1 – 2x = 0 
 ?  (x - 1)
2
 = 0 
 ? x = 1 
 
17 17
19 19
1 1
x 1 2
x 1
? ? ? ? ? 
 
29. 3 
29. Let runs required = x 
 ? 15 ? 6 + x ? 5 = 7.2 ? 20 
 ? x = 54    
 ? required run rate = 
54
10.8
5
? 
 
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