1 Crore+ students have signed up on EduRev. Have you? 
Directions: Find the odd one out.
3, 5, 7, 12, 17, 19
Each of the numbers is a prime number except 12.
Directions: Find the odd one out.
41, 43, 47, 53, 61, 71, 73, 81
Each of the numbers except 81 is a prime number.
Directions: Find the odd one out.
835, 734, 642, 751, 853, 981, 532
In each number except 751, the difference of third and first digit is the middle one.
Directions: Find the odd one out.
331, 482, 551, 263, 383, 362, 284
In each number except 383, the product of first and third digits is the middle one.
Directions: Find the odd one out.
16, 25, 36, 72, 144, 196, 225
Each of the numbers except 72 is a perfect square.
Directions: Find the odd one out.
2, 5, 10, 17, 26, 37, 50, 64
(1 × 1) + 1, (2 × 2) + 1, (3 × 3) +1, (4 × 4) + 1,
(5 × 5) + 1, (6 × 6) + 1, (7 × 7) + 1, (8 × 8) + 1
But, 64 is out of pattern.
Directions: Find the odd one out.
582, 605, 588, 611, 634, 617, 600
Alternatively 23 is added and 17 is subtracted from the terms. So, 634 is wrong.
Directions: Find the odd one out.
56, 72, 90, 110, 132, 150
The numbers are 7 x 8, 8 x 9, 9 x 10, 10 x 11, 11 x 12, 12 x 13.
So, 150 is wrong.
Directions: Find the odd one out.
36, 54, 18, 27, 9, 18.5, 4.5
The terms are alternatively multiplied by 1.5 and divided by 3. However, 18.5 do not satisfy it.
Directions: Find the odd one out.
6, 13, 18, 25, 30, 37, 40
The differences between two successive terms from the beginning are 7, 5, 7, 5, 7, 5.
So, 40 is wrong.
Directions: Find the odd one out.
46080, 3840, 384, 48, 24, 2, 1
The terms are successively divided by 12, 10, 8, 6, ...etc.
So, 24 is wrong, it should be 8 (48/6 = 8).
Directions: Find the odd one out.
7, 8, 18, 57, 228, 1165, 6996
Let the given numbers be A, B, C, D, E, F, G.
Then, A, A x 1 + 1, B x 2 + 2, C x 3 + 3, D x 4 + 4, E x 5 + 5, F x 6 + 6 are the required numbers.
Clearly, 228 is wrong.
Directions: Find the odd one out.
190, 166, 145, 128, 112, 100, 91
Go on subtracting 24, 21, 18, 15, 12, 9 from the numbers to get the next number.
190 – 24 = 166
166 – 21 = 145
145 – 18 = 127 [Here, 128 is placed instead of 127] 127 – 15 = 112
112 – 12 = 100 ... and so on.
Therefore, 128 is wrong.
Directions: Find the odd one out.
445, 221, 109, 46, 25, 11, 4
Go on subtracting 3 and dividing the result by 2 to obtain the next number.
Clearly, 46 is wrong.
Directions: Find the odd one out.
196, 169, 144, 121, 100, 80, 64
Numbers must be (14)^{2}, (13)^{2}, (12)^{2}, (11)^{2}, (10)^{2}, (9)^{2}, (8)^{2}.
So, 80 is wrong.
Directions: Find the odd one out.
3, 7, 15, 27, 63, 127, 255
Go on multiplying the number by 2 and adding 1 to it to get the next number.
So, 27 is wrong.
Directions: Find the odd one out.
2880, 480, 92, 24, 8, 4, 4
Go on dividing by 6, 5, 4, 3, 2, 1 respectively to obtain the next number.
Clearly, 92 is wrong.
Directions: Find the odd one out.
10, 26, 74, 218, 654, 1946, 5834
2^{nd} term = (1^{st} term) × 3 – 4 = 10 × 3 – 4 = 26
3^{rd} term = (2^{nd} term) × 3 – 4 = 26 × 3 – 4 = 74
4^{th} term = (3^{th} term) × 3 – 4 = 74 × 3 – 4 = 218
5^{th} term = (4^{th} term) ×3 – 4 = 218 × 3 – 4 = 650.
5^{th} term must be 650 instead of 654.
Directions: Find the odd one out.
15, 16, 34, 105, 424, 2124, 12576
2^{nd} term = (1^{st} term) x 1 + 1 = 15 x 1 + 1 = 16
3^{rd} term = (2^{nd} term) x 2 + 2 = 16 x 2 + 2 = 34
4^{th} term = (3^{th} term) x 3 + 3 = 34 x 3 + 3 = 105.
5^{th} term = (4^{th} term) x 4 + 4 = 105 x 4 + 4 = 424
6^{th} term = (5^{th} term) x 5 + 5 = 424 x 5 + 5 = 2125
6^{th} term should 2125 instead of 2124.
Directions: Find the odd one out.
64, 71, 80, 91, 104, 119, 135, 155
Go on adding 7, 9, 11, 13, 15, 17, 19 respectively to obtain the next number.
So, 135 is wrong.
55 tests

Use Code STAYHOME200 and get INR 200 additional OFF

Use Coupon Code 
55 tests









