# 100+ Number Series Completion Questions and Answers - 1

Question: 1

In each of the following questions, a number series is given with one term missing. Choose the correct alternative that will continue the same pattern and fill in the blank spaces.

97, 86, 73, 58, 45, (…..)

(A) 24

(B) 34

(C) 44

(D) 54

Ans: B

The pattern is - 11, - 13, - 15, - 13, …

∴ Missing number = 45 – 11 = 34.

Question: 2

1, 4, 2, 8, 6, 24, 22, 88, (…..)

(A) 352

(B) 154

(C) 90

(D) 86

Ans: D

The pattern is x 4, -2, x 4 ,– 2,…

∴ Missing number = 88 – 2 = 86.

Question: 3

3, 8, 22, 63, 185, (…..)

(A) 285

(B) 295

(C) 310

(D) 550

Ans: D

The pattern is x 3 – 1, x 3 – 2, x 3 – 3, x 3 – 4, ….

∴ Misisng number = (185 x 3) – 5 = 550.

Question: 4

3, 7, 15, 31, 63, (…..)

(A) 92

(B) 115

(C) 117

(D) 127

Ans: D

Each number in the series is the preceding number multiplied by 2 and then increased by 1.

Thus, (3 x 2) + 1 = 7, (7 x 2) + 1 = 15, (15 x 2) + 1 = 31 and so on.

∴ Missing number = (63 x 2) + 1 = 127.

Question: 5

6, 11, 21, 36, 56, (…..)

(A) 41

(B) 51

(C) 61

(D) 81

Ans: D

The pattern is +5, +10, +15, +20, …

∴ Missing number = 56 + 25 = 81.

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