Question 1

8, 13, 21, 32, 47, 63, 83

Accepted Answer

The correct pattern is + 5, + 8, + 11, + 14,..... So, 47 is wrong and must be replaced by (32 + 14) i.e. 46.

Question 2

1, 2, 4, 8, 16, 32, 64, 96

Accepted Answer

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.

Question 3

3, 4, 10, 32, 136, 685, 4116

Accepted Answer

The correct pattern is x 1 + 1, x 2 + 2, x 3 + 3, x 4 + 4,..... So, 32 is wrong and must be replaced by (10 x 3 + 3) i.e. 33.

Question 4

105, 85, 60, 30, 0, - 45, - 90

Accepted Answer

The correct pattern is - 20, - 25, - 30,..... So, 0 is wrong and must be replaced by (30 - 35) i.e. - 5.

Question 5

2, 5, 10, 17, 26, 37, 50, 64

Accepted Answer

The terms of the series are (12 + 1), (22 + 1), (32 + 1), (42 + 1), (52 + 1), (62 + 1), (72+1),..... So, 64 is wrong and must be replaced by (82 + 1) i.e. 65.

Question 6

125, 126, 124, 127, 123, 129

Accepted Answer

The correct pattern is + 1, - 2, + 3, - 4, + 5. So, 129 is wrong and must be replaced by (123 + 5) i.e. 128.

Question 7

2, 5, 10, 50, 500, 5000

Accepted Answer

Each term of the series is the product of the preceding two terms. So, 5000 is wrong and must be replaced by (50 x 500) i.e. 25000.

Question 8

1,3,12,25,48

Accepted Answer

The terms of the series are (l2 - 02), (22 - l2), (42 - 22), (62 - 32) and (82 - 42). So, 25 is wrong and must be replaced by (62 - 32) i.e. 27.

Question 9

15, 16, 22, 29, 45, 70

Accepted Answer

The correct pattern is + 1, + 4, + 9, + 16, + 25 i.e. + 12, + 22, + 32, + 42, + 52. So, 22 is wrong and must be replaced by (16 + 4) i.e. 20.

Question 10

8, 14, 26, 48, 98, 194, 386

Accepted Answer

The correct pattern is x 2 - 2. So, 48 is wrong and must be replaced by (26 x 2 - 2) i.e. 50.

Question 11

3, 10, 27, 4, 16, 64, 5, 25, 125

Accepted Answer

The correct sequence is 3, 32, 33, 4, 42, 43, 5, 52, 53. So, 10 is wrong and must be replaced by 32 i.e. 9.

Question 12

1, 5, 9, 15, 25, 37, 49

Accepted Answer

The terms of the given series are 12, (22 + 1), 32, (42..+ 1), 52, (62 + 1), 72. So, 15 is wrong and must be replaced by (42 + 1) i.e. 17.

Question 13

4, 10, 22, 46, 96, 190, 382

Accepted Answer

The correct pattern is + 6, + 12, + 24, + 48, + 96, + 192. So, 96 is wrong and must be replaced by (46 + 48) i.e. 94.

Question 14

2, 6, 24, 96, 285, 568, 567

Accepted Answer

The correct pattern is x 6 - 6, x 5 - 5, x 4 - 4,..... So, 24 is wrong and must be replaced by (6 x 5 - 5) i.e. 25.

Question 15

3, 2, 8, 9, 13, 22, 18, 32, 23, 42

Accepted Answer

The given sequence is a combination of two series: I. 3, 8, 13, 18, 23 and II. 2, 9, 22, 32, 42 The pattern in I is + 5, and the pattern in II is + 10. So, in II, 9 is wrong and must be replaced by (2 + 10) i.e. 12.

Question 16

196, 169, 144, 121, 101

Accepted Answer

The sequence is (14)2, (13)2, (12)2, (11)2, (10)2. So, 101 is wrong and must be replaced by (10)2 i.e. 100.

Question 17

56, 58, 62, 70, 84, 118, 182

Accepted Answer

The correct pattern is + 2, + 4, + 8, + 16, + 32, + 64 i.e. + 2, + 22, + 23, + 24, + 25, + 26. So, 84 is wrong and must be replaced by (70 + 16) i.e. 86.

Question 18

1, 5, 5, 9, 7, 11, 11, 15, 12, 17

Accepted Answer

The given sequence is a combination of two series: I. 1, 5, 7, 11, 12 and II. 5, 9, 11, 15, 17 The pattern in both I and II is + 4, + 2, + 4, + 2. So, 12 is wrong and must be replaced by (11 + 2) i.e. 13.

Question 19

25, 36, 49, 81, 121, 169, 225

Accepted Answer

The correct sequence is 52, 72, 92, 112, 132, 152. So, 36 is wrong.

Question 20

1, 3, 10, 21, 64, 129, 356, 777

Accepted Answer

The correct pattern is x 2 + 1, x 3 + 1, x 2 + 1, x 3 + 1,..... So, 356 is wrong and must be replaced by (129 x 3 + 1) i.e. 388.

Series Completion Questions