Question 1

In the following number series only one number is wrong. Find out the wrong number ? 6, 15, 35, 63, 143, 221, 323

Accepted Answer

Here the series follows the pattern that, product of succesive prime numbers i.e, 2 × 3 = 6 3 × 5 = 15 5 × 7 = 35 7 × 11 = 77 11 × 13 = 143 13 × 17 = 221 17 × 19 = 323 So here in place of 77 the number 63 is written. So the wrong number is 63.

Question 2

Find the odd man out of the series? 128, 32, 14, 2.66, 0.88

Accepted Answer

Here the given series is 128, 32, 14, 2.66, 0.88 128 / 4 = 32 32 / 3 = 10.666 10.666 / 4 = 2.666 2.666 / 3 = 0.888 Hence, the odd man in the given number series is 14.

Question 3

What will come in place of question mark (?) in the following number series? 4, 3, 4, 7, 15, ?

Accepted Answer

4 3 4 7 15 ? ×1-1 ×1+1 ×2-1 ×2+1 ×3-1 15x3 - 1 = 45 - 1 = 44

Question 4

Find the odd one in the number series given below ? 17, 9, 10, 18.5, 35, 90

Accepted Answer

The given series pattern follows 17 9 10 18.5 35 90 × 0.5 + 0.5, × 1 + 1, × 1.5 + 1.5, × 2 + 2, × 2.5 + 2.5 So here 17x0.5 + 0.5 = 9 9x1 + 1 = 10 10x1.5 + 1.5 = 16.5 16.5x2 + 2 = 35 35x2.5 + 2.5 = 90 Here the odd man in the given series is 18.5

Question 5

In the following number series, one of the numbers is wrong. Find it out? 77, 79, 76, 81, 75, 85

Accepted Answer

Here in the given series, it follows a pattern that 77 + 2 = 79 79 - 3 = 76 76 + 5 = 81 81 - 7 = 74 74 + 11 = 85 Consecutive adding and subtracting of prime numbers. So the wrong number in the given series is 75.

Question 6

Find the Odd Number in the given Number Series? 3, 6.5, 14, 29, 64, 136

Accepted Answer

The Given number series 3, 6.5, 14, 29, 64, 136 follows a pattern that 3 3 x 2 + 0.5 = 6.5 6.5 x 2 + 1 = 14 14 x 2 + 2 = 30 ≠ 29 30 x 2 + 4 = 64 64 x 2 + 8 = 136 Thus the wrong number in the series is 29

Question 7

Find the Odd One Out of the following Number Series? 3, 14, 36, 67, 113, 168

Accepted Answer

Here the given number series is 3, 14, 36, 67, 113, 168 It follows a pattern that 3 3 + 1 x 11 = 3 + 11 = 14 14 + 2 x 11 = 14 + 22 = 36 36 + 3 x 11 = 36 + 33 = 69 69 + 4 x 11 = 69 + 44 = 113 113 + 5 x 11 = 113 + 55 = 168 Hence, the wrong number is 67.

Question 8

what is the missing number in the sequence given below? 12 9 13.50 30.37 ? 341.71

Accepted Answer

Given number series is 12 9 13.5 30.3 ? 341.7 Here the pattern followed by the series is 12 12 x 0.75 = 9 9 x 1.5 = 13.5 13.5 x 2.25 = 30.3 30.37 x 3 = 91.12 91.12 x 3.75 = 341.71 Hence, the missing number in the sequence is 91.12.

Question 9

1 4 27 Sequence ... Find the next two numbers in the above sequnce?

Accepted Answer

The above given sequence follows a pattern that, 1 2 2 = 4 3 3 = 27 4 4 = 256 5 5 = 3125 6 6 = 46656 and so on . . . Therefore, the next two numbers in the given sequence is 256 & 3125.

Question 10

Find the next two numbers in the sequence 4, 12, 6, 18, 12, 26, 30, ?, ?

Accepted Answer

the next 2 number in series we need to divide the series into 2 different series First series : 4 , 6, 12, 30 ?? Second Series : 12,18,26, ?? So we need to see for the pattern for those series in order to find the next two number , we can do this by finding the difference or division , multiplication logic whatever may apply : Pattern of Series 1 : 6 divide 4 : 1.5 Next number i.e 12 divided by 6=2 Next number i.e 30 divided by 12 =2.5 So series is going in multiples of 1.5, 2, 2.5, 3 , so on So first series will look like 4 , 6, 12, 30, 30x3 =90 Pattern of Series 2 : 12,18,26, ?? Its simple Adding numbers with iterative logic (i.e 6, 8, then followed by 10, 12) Series will be like 12,18,26,36. For the next two numbers : Series will be like 4, 12, 6, 18, 12, 26, 30, 36, 90

Question 11

9 17 11 19 13 What Are The Next Three Numbers In The Given Number Series?

Accepted Answer

Given number series is 9 17 11 19 13 Here the pattern is 9 9 + 8 = 17 17 - 6 = 11 11 + 8 = 19 19 - 6 = 13 13 + 8 = 21 21 - 6 = 15 15 + 8 = 23

Question 12

Find out the wrong term in the given series of numbers ? 6, 15, 35, 77, 165, 221

Accepted Answer

The given series follow the rule that : Multiplying consecutive prime numbers 2,3,5,7,11,13,17,19.... 2x3 = 6 3x5 = 15 5x7 = 35 7x11 = 77 11x13 = 143 13x17 = 221 So, the wrong term is 165.

Question 13

Find out the wrong number in the following series: 5, 15, 30, 80, 180, 540, 1080

Accepted Answer

There should be 90 instead of 80 so we can have a series 5, 5x3, 15x2, 30x3, 90x2, 180x3, 540x2 and 1080x3 and so on...

Question 14

Find the odd number out of the following number series? 2 4 8 11.5 18.25 28.375

Accepted Answer

Given number series follows a pattern that, 2 2 x 1.5 + 1 = 4 4 x 1.5 + 1 = 7 (not equal to 8) 7 x 1.5 + 1 = 11.5 11.5 x 1.5 + 1 = 18.25 18.25 x 1.5 + 1 = 28.375 Hence, the odd number in the given number series is 8.

Question 15

Find the next number in the following number series? 11, 13, 30, 96, ?

Accepted Answer

The given number series 11, 13, 30, 96, ? follows a pattern that, 11 11 x 1 + 2 = 13 13 x 2 + 4 = 30 30 x 3 + 6 = 96 96 x 4 + 8 = 392 Hence, the next number in the given series is 392.

Question 16

Find the wrong number in the given number series? 5, 8, 40, 90, 664

Accepted Answer

The given number series is 5, 8, 40, 90, 664 5 5 - 1 x 2 = 8 8 - 3 x 4 = 20 (NOT 40) 20 - 5 x 6 = 90 90 - 7 x 8 = 664

Question 17

What number should replace the question mark? 125, 138, 164, ?, 255

Accepted Answer

The given number series is 125, 138, 164, ?, 255 125 125 + 13x1 = 138 138 + 13x2 = 164 164 + 13x3 = 203 203 + 13x4 = 255 Hence, the missing number in the series is 203.

Question 18

What is the next number in this series ? 4, 6, 12, 18, 30, 42, 60, ?

Accepted Answer

With close observation, you will note that each number in the list is in the middle of two prime numbers. Thus: 4 is in the middle of 3 and 5, 6 is in the middle of 5 and 7, 12 is in the middle of 11 and 13, 18 is in the middle of 17 and 19, 30 is in the middle of 29 and 31. 42 is in the middle of 41 and 43, 60 is in the middle of 59 and 61. Therefore, the next number would be the one that is in the middle of the next two prime numbers, which is 72 (which is in the middle of 71 and 73).

Question 19

Find the odd one out of the group ?

Accepted Answer

The sum of the digits in 708, 618 and 816 is 15, but not in 392.

Question 20

Find the odd one in the given series ? 5-20-25, 10-40-50, 4-15-24, 25-100-125

Accepted Answer

In each term second two numbers are multiples of the first number. But in 4-15-24 15 is not multiple of 4.

Odd Man Out and Series Questions