Question 1

Insert the missing number. 2, 6, 12, 20, 30, 42, 56, (....)

Accepted Answer

The pattern is 1 x 2, 2 x 3, 3 x 4, 4 x 5, 5 x 6, 6 x 7, 7 x 8. So, the next number is 8 x 9 = 72.

Question 2

Find out the wrong number in the given sequence of numbers. 1, 2, 6, 15, 31, 56, 91

Accepted Answer

1, 1 + 12 = 2, 2 + 22 = 6, 6 + 32 = 15, 15 + 42 = 31, 31 + 52 = 56, 56 + 62 = 92 Last number of given series must be 92 not 91.

Question 3

Find the odd man out. 331, 482, 551, 263, 383, 362, 284

Accepted Answer

In each number except 383, the product of first and third digits is the middle one.

Question 4

Find out the wrong number in the given sequence of numbers. 582, 605, 588, 611, 634, 617, 600

Accepted Answer

Alternatively 23 is added and 17 is subtracted from the terms. So, 634 is wrong.

Question 5

Find the odd man out. 253, 136, 352, 324, 631, 244

Accepted Answer

The Sum of the digits in each number, Except 324 is 10.

Question 6

Find out the wrong number in the given sequence of numbers. 36, 54, 18, 27, 9, 18.5, 4.5

Accepted Answer

The terms are alternatively multiplied by 1.5 and divided by 3. However, 18.5 does not satisfy it.

Question 7

Find out the wrong number in the given sequence of numbers. 52, 51, 48, 43, 34, 27, 16

Accepted Answer

Subtract 1, 3, 5, 7, 9, 11 from successive numbers. So, 34 is wrong.

Question 8

Find out the wrong number in the series. 7, 8, 18, 57, 228, 1165, 6996

Accepted Answer

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.

Question 9

Find out the wrong number in the given sequence of numbers. 6, 13, 18, 25, 30, 37, 40

Accepted Answer

The differences between two successive terms from the beginning are 7, 5, 7, 5, 7, 5. So, 40 is wrong.

Question 10

Find the one which does not belong to that group ?

Accepted Answer

The digits on either side of the letter in each of the groups 1P6, 2T0, and 1R8 indicate the place value of the letter in the alphabet. This pattern is not followed by 2Y4.

Question 11

Insert the missing number. 16, 33, 65, 131, 261, (....)

Accepted Answer

Each number is twice the preceding one with 1 added or subtracted alternatively. So, the next number is (2 x 261 + 1) = 523.

Question 12

Find the odd one out of the following options.

Accepted Answer

Except Granite all other options belong to the group of precious stones.

Question 13

Find the odd number in the following number series? 24, 4, 13, 41, 151, 640

Accepted Answer

The given number series follows the pattern that, 24×0 + 4 = 4 4×1 + 9 = 13 13×2 + 16 = 42 42×3 + 25 = 151 151×4 + 36 = 640 Therefore, the odd number in the given series is 41

Question 14

10 25 45 54 60 75 85 Find the Odd Number?

Accepted Answer

In given Series, all the numbers except 54 are multiples of 5.

Question 15

Find the odd term from the given series of numbers ? 125, 127, 130, 135, 142, 153, 165 ?

Accepted Answer

From the beginning, the next term comes by adding prime numbers in a sequence of 2, 3, 5, 7, 9, 11, 13... to its previous term. But 165 will not be in the series as it must be replaced by 166 since 153+13 = 166.

Question 16

Find out the wrong number in the given sequence of numbers. 5, 16, 6, 16, 7, 16, 9

Accepted Answer

Terms at odd places are 5, 6, 7, 8 etc. and each term at even place is 16. So, 9 is wrong.

Question 17

3125 256 ? 4 1 Which number replaces the "?" in the question?

Accepted Answer

In the given series numbers are arranged following the rule, 5 5 , 4 4 , 3 3 , 2 2 , 1 1 Therefore, the missing number is 27.

Question 18

Find the odd man out of the series given 8, 16, 20, 36, 68

Accepted Answer

The given number series is 8, 16, 20, 36, 68 8 8 x 2 - 4 = 12 (NOT 16) 12 x 2 - 4 = 20 20 x 2 - 4 = 36 36 x 2 - 4 = 68 Hence, the odd man in the given series is 16.

Question 19

2.5, 3.5, 9, 40, ? Find the next number in the above-given series?

Accepted Answer

2.5 × 1 + 1 = 3.5 3.5 × 2 + 2 = 9 9 × 4 + 4 = 40 40 × 8 + 8 = 328

Question 20

194, 194, 191, 183, 168, ? Find the next number in the above series?

Accepted Answer

Here the series follows, 194 194 - (1x1 - 1) = 194 194 - (2x2 - 1) = 191 191 - (3x3 - 1) = 183 183 - (4x4 - 1) = 168 168 - (5x5 - 1) = 144

Odd Man Out and Series Questions