Question 1

Find the one which does not belong to that group ?

Accepted Answer

343 = 7 3 , 1331 = 11 3 , 2197 = 13 3 , 121 = 11 2 343, 1331, 2197 are perfect cubes, but not 121.

Question 2

Find the Odd one out of the given series 6, 15, 35, 77, 165, 221

Accepted Answer

The terms of the series are products of two consecutive prime numbers i.e. (2 x 3), (3 x 5), (5 x 7), (7 x 11),..... So, 165 is wrong and must be replaced by (11 x 13) i.e. 143.

Question 3

Find out the wrong number in the given sequence of numbers. 56, 72, 90, 110, 132, 150

Accepted Answer

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.

Question 4

What comes next in this sequence 196, 169, 144, 121, 100, 81, ?

Accepted Answer

The given number series follows a pattern that 196, 169, 144, 121, 100, 81, ? -27 -25 -23 -21 -19 -17 => 81 - 17 = 64 Therefore, the series is 196, 169, 144, 121, 100, 81, 64.

Question 5

Find the odd one out ? Hawk , Parrot , Owl , Eagle

Accepted Answer

All except Parrot are birds of prey.

Question 6

6, 3, 3, 6, 24, ? Find the next number in the given number series?

Accepted Answer

Given 6 3 3 6 24 ? Here 6 6 x 0.5 = 3 3 x 1 = 3 3 x 2 = 6 6 x 4 = 24 24 x 8 = 192 The next number in the given series is 192.

Question 7

1, 2, 8, 33, ? Find the next number in the given series?

Accepted Answer

1 x 1 + 1 x 1 = (1 + 1) = 2 2 x 2 + 2 x 2 = (4 + 4) = 8 8 x 3 + 3 x 3 = (24 + 9) = 33 33 x 4 + 4 x 4 = (132 + 16) = 148 148 x 5 + 5 x 5 = (740 + 25) = 765.

Question 8

3, 12, 5, ?

Accepted Answer

3 3 2 + 3 = 12 5 5 2 + 5 = 30

Question 9

Find the missing number in the following Series ? 18, 97, 26, 91, ? , 83

Accepted Answer

The given series follows the pattern that, 18, 97, 26, 91, ?, 83 => 18 + 8 = 26 => 97 - 8 = 91 => 26 + 8 = 34 => 91 - 8 = 83 Hence, the missing number is 34.

Question 10

Find the odd one out of the series ? 35, 48, 54, 63, 81, 105

Accepted Answer

48, 54, 63, 81 and 105 are divisible by 3 but not 35.

Question 11

Find the odd man out from the given alternatives ?

Accepted Answer

Except 437 all others are prime numbers.

Question 12

What will come in place of the question mark (?) in the following number series? 5, 7, ?, 25, 45, 75

Accepted Answer

The series given follow the pattern +2, +2+4, +2+4+6, +2+4+6+8, +2+4+6+8+10,... Here ? = 7 + 2 + 4 = 13.

Question 13

Mark the odd man out of the series? 1 6 27 124 650

Accepted Answer

The given series is 1 6 27 124 650 1 1 + 2 x 2 = 6 6 + 3 x 3 = 27 27 + 4 x 4 = 124 124 + 5 x 5 = 645 (NOT 650) Hence, the odd man in the given number series is 650.

Question 14

What value will come in place of question mark (?) in the number - series given below ? 4, 30, ?, 1440, 7195, 71940

Accepted Answer

4 30 ? 1440 7195 71940 Here the given series follows a pattern of 4 4 x 10 - 10 = 30 30 x 5 - 5 = 145 145 x 10 - 10 = 1440 1440 x 5 - 5 = 7195 7195 x 10 - 10 = 71940 Hence, the missing number is 145

Question 15

Find the missing number? 15, 30, ? , 40, 8, 48

Accepted Answer

Given nuber series is 15, 30, ? , 40, 8, 48 Here the number series follows a pattern that 15 15 x 2 = 30 30 ÷ 3 = 10 10 x 4 = 40 40 ÷ 5 = 8 8 x 6 = 48 Hence, the missing number in the series is 10.

Question 16

7 9 19 18 31 29 Find the odd number in the given Number Series?

Accepted Answer

Here the given number series follows a pattern of two alternate series. 1. 7 19 31 ...(Difference of 12) 2. 9 18 27 ...(Difference of 9) Here the odd number is 29 instead of 27 And the next number is 31 + 12 = 43 & 27 + 9 = 36

Question 17

What will come in place of the question mark (?) in the following number series ? 12, 24, 26.5, 79.5, ?, 330

Accepted Answer

The given series 12 24 26.5 79.5 ? 330 follows a pattern that, 12 x 2 = 24 24 + 2.5 = 26.5 26.5 x 3 = 79.5 79.5 + 3 = 82.5 82.5 x 4 = 330 Hence, the missing number is 82.5

Question 18

A man saves Rs. 200 in each of the first three months of his service. In each of the subsequent months his saving increases by Rs. 40 more than the saving of immediately previous month. His total saving from the start of service will be Rs. 11040 af…

Accepted Answer

Total savings = 200 + 200 + 200 + 240 + 280 + ... to n months = 11040 = 120 + 80 + 160 + 40 + 200 + 240 + ....n terms = 40 + 80 + 120 + 160 + 200 + 240 + ...n terms = n/2[2a + (n-1)d] + 80 + 40 = 11040 = n/2[240 + (n-1)40] = 10920 = n[6+n-1] = 546 = n[n+5] = 546 n = 21

Question 19

Find the odd letter/word from the given alternatives.

Accepted Answer

Except Horse, remaining all belong to female category. Hind - Female Deer Ewe - Female Sheep Bitch - Female Dog.

Question 20

In following number series only one number is wrong. Find out that wrong or odd number in the series? 6, 78, 858, 7722, 54055, 270270

Accepted Answer

Here the given series follows a pattern that, multiplying the number with odd numbers in decreasing order starting with 13. That is, 6 × 13 = 78 65 × 11 = 858 858 × 9 = 7722 7722 × 7 = 54054 54054 × 5 = 270270 Hence, the wrong number is 54055

Odd Man Out and Series Questions