Question 1

1, 4, 9, 16, 20, 36, 49?

Accepted Answer

The pattern is 12, 22, 32, 42, 52, 62, 72 . But, instead of 52, It is 20, which is to be turned out.

Question 2

10, 25, 45, 54, 60, 75, 80?

Accepted Answer

Each of the number except 54, is a multiple of 5.

Question 3

16, 25, 36, 72, 144, 196, 225?

Accepted Answer

Each of the number except 72, is a perfect square.

Question 4

6, 9, 15, 21, 24, 28, 30?

Accepted Answer

Each of the number except 28, is a multiple of 3.

Question 5

1, 4, 9, 16, 23, 25, 36?

Accepted Answer

Each of the given number is except 23, is perfect square

Question 6

3, 5, 9, 11, 14, 17, 21?

Accepted Answer

Each of the number except 14, is an odd number .

Question 7

10, 14, 16, 18, 21, 24, 26?

Accepted Answer

Each of the number except 21, is an even number .

Question 8

3, 5, 7, 12, 13, 17, 19?

Accepted Answer

Each of the number except 12, is a prime number

Question 9

5, 16, 6, 16, 7, 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 10

582, 605, 588, 611, 634, 617, 600?

Accepted Answer

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

Question 11

22, 33, 66, 99, 121, 279, 594?

Accepted Answer

Each number except 279 is a multiple of 11.

Question 12

2, 5, 10, 50, 500, 5000?

Accepted Answer

Pattern is 1st x 2nd = 3rd; 2nd x 3rd = 4th, 3rd x 4th = 5th. But 4th x 5th = 50 x 500 = 25000 ≠ 5000 = 6th.

Question 13

1, 8, 27, 64, 125, 216, (...) :

Accepted Answer

Number are 13, 23, 33, 43, 53, 63. So, the missing number is 73 = 343.

Question 14

4 - 8, 16 - 32, 64 - (...) :

Accepted Answer

Each number is the preceding number multiplied by - 2. So, the required number is - 128.

Question 15

125, 123, 120, 115, 108, 100, 84?

Accepted Answer

Prime numbers 2, 3, 5, 7, 11, 13 have successively been subtracted. So, 100 is wrong. It must be (108 - 11) i.e., 97.

Question 16

125, 127, 130, 135, 142, 153, 165?

Accepted Answer

Prime number 2, 3, 5, 7, 11, 13 are to be added successively. So, 165 is wrong.

Question 17

52, 51, 48, 43, 34, 27, 16?

Accepted Answer

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

Question 18

Find the wrong number in the series 3, 8, 15, 24, 34, 48, 63?

Accepted Answer

The difference between consecutive terms are respectively. 5, 7, 9, 11 and 13. So, 34 is a wrong number.

Question 19

2, 4, 12, 48, 240, (...)?

Accepted Answer

Go on multiplying the given numbers by 2, 3, 4, 5, 6. So, the correct next number is 1440.

Question 20

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.

Odd Man Out and Series Questions