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Directions (1-15): In each of the following questions, one term in the number series is wrong. Find out the wrong term.
1. 24, 27, 31, 33, 36 
(a) 24 
(b) 27 
(c) 31 
(d) 33

2. 196, 169, 144, 121, 80
(a) 80 
(b) 121 
(c) 169 
(d) 196

3. 3, 5, 7, 9, 11, 13
(a) 3 
(b) 5 
(c) 7 
(d) 9

4. 121, 143, 165, 186, 209 
(a) 143 
(b) 165 
(c) 186 
(d) 209

5. 1, 2, 4, 8, 16, 32, 64, 96 
(a) 4 
(b) 32 
(c) 64 
(d) 96

6. 8, 14, 26, 48, 98, 194, 386
(a) 14 
(b) 48 
(c) 98 
(d) 194

7. 8, 13, 21, 32, 47, 63, 83
(a) 13 
(b) 21 
(c) 32 
(d) 47

8. 3, 10, 27, 4, 16, 64, 5, 25, 125 
(a) 3 
(b) 4 
(c) 10 
(d) 27

9. 380, 188, 92, 48, 20, 8, 2
(a) 188 
(b) 92 
(c) 48 
(d) 20

10. 1, 3, 7, 15, 27, 63, 127
(a) 7 
(b) 15 
(c) 27 
(d) 63

11. 2, 5, 10, 17, 26, 37, 50, 64
(a) 50 
(b) 26 
(c) 37
(d) 64

12. 1, 3, 10, 21, 64, 129, 256, 778
(a) 10 
(b) 21 
(c) 129 
(d) 256

13. 15, 16, 22, 29, 45, 70
(a) 16 
(b) 22 
(c) 45 
(d) 70

14. 6, 14, 30, 64, 126 
(a) 6 
(b) 14 
(c) 64 
(d) 126

15. 10, 26, 74, 218, 654, 1946, 5834
(a) 26 
(b) 74 
(c) 218 
(d) 654


Answer Of Series Completion Questions 
1. (c) : Each term in the series is increased by 3 to obtain the next term. So. 31 is wrong and must be replaced by (27 + 3) i.e. 30.

2. (a)

3. (d) : The series consists of consecutive prime numbers. So. 9 is wrong.

4. (c): Each term of the series is increased by 22 to obtain the next term. So. 186 is wrong and must be replaced by (165 + 22) i.e. 187.

5. (d) : Each term of the series is obtained by multiplying the preceding term by 2 So, 96 is wrong and must be replaced by (64 x 2) i.e. 128.

6. (b) : Each term in the series is less than twice the preceding term by 2. So. 48 is wrong and should be replaced by (26 x 2 - 2) i.e. 50.

7. (d) : Go on adding 5, 8, 11, 14, 17, 20.
So, the number 47 is wrong and must be replaced by 46.

8. (c)

9. (c) : The correct pattern is - 192, - 96, - 48, - 24, - 12, - 6.
So, 48 is wrong and must be replaced by (92 - 48) i.e. 44.

10. (c)

11. (d): (1x1)+1 , (2x2)+1 , (3x3)+1 , (4x4)+1 , (5x5)+1 , (6x6)+1 , (7x7)+1 , (8x8)+1
But, 64 is out of pattern.

12. (d) : The sequnece is ( x 2 + 1, x 3 + 1, x 2 + 1, x 3 + 1,....)
So, 256 is wrong and must be replaced by (129 x 2 + 1)  i.e.  259.

13. (b)

14. (c): Each term is multiplied by 2 and then increased by 2 to obtain the next term. So, 64 is wrong and must be replaced by (30 x 2 + 2) i.e. 62.

15. (d): Each term is 4 less than thrice the preceding number.
So, 654 is wrong and must be replaced by (218 x 3 - 4) - 650.


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