In this type of questions, a figure or a matrix is given in which some numbers are filled according to a rule. A place is left blank. You have to find out a character (a number or a letter) from the given possible answers which may be filled in the blank space.
Example 1: Which number will replace the question mark ?
Solution:
From fig. a: 6 + 4 + 8 = 18
18 + 2 = 20
From fig. b: 7 + 9 + 8 = 24
24 + 2 = 26
From fig. c: 6 + 5 + 12 = 23
23 + 2 = 25
Hence the number 25 will replace the question mark.
Example 2: Which number will replace the question mark ?
Solution:
From fig. a: (3)^{2} + (2)^{2} = 13
From fig. b: (4)^{2} + (8)^{2} = 80
From fig. c: ? = (1)^{2} + (5)^{2}
? = 1 + 25
? = 26
Hence the number 26 will replace the question mark.
Example 3: Which number will replace the question mark?
Solution:
From fig. a: 7 x 6 + 3 = 45
From fig. b: 5 x 4 + 6 = 26
From fig. c: 7 x 3 + 8 = 29
Hence the number 29 will replace the question mark.
From column I: (9 x 5) % 5 = 9
From column II: (17 x 4) % 4 = 17
From column III: (16 x ?) % 8 = 8
16? = 64
? = 4
Hence the number 4 will replace the question mark.
Example 5: Which number will replace the question mark ?
Solution:
From fig. a: (8 x 5)  (4 x 3) = 28
From fig. b: (12 x 7)  (8 x 9) = 12
From fig. c: (5 x 3)  (6 x ?) = 21
15  6? = 21
6? = 6
? = 1
Hence the number 1 will replace the question mark.
Example 6: Which number will replace the question mark ?
Solution:
In each row there are 'A', 'B' and 'C'
In second row 'A' and 'C' are already there
Hence in place of ?, there will be 'B'.
From first row : 4A x 6C = 24B
From third row : 9B x 4C = 36A
From second row : 5A x ? = 45C
? = (45C/5A)
? = 9B
Hence the number 9B will replace the question mark.
Example 7: Which number will replace the question mark?
Solution:
(5)^{2} = 25
(6)^{2} = 36
(4)^{2} = 16
(7)^{2} = 49
Hence the number 49 will replace the question mark.
Example 8: Which one will replace the question mark?
Solution:
(15 x 2  3) = 27
(31 x 2  6) = 56
(45 x 2  9) = 81
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