100+ Series Completion Verbal Reasoning Questions & 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.
5, 9, 17, 29, 45, (…..)

(A) 50

(B) 60

(C) 65

(D) 80

Ans: C

The pattern is +4, +8, +12, +16, ….
∴ Missing number = 45 + 20 = 65.

Question: 2

1, 3, 4, 8, 15, 27, (…..)

(A) 35

(B) 40

(C) 45

(D) 50

Ans: D

The sum of any three consecutive terms of the series gives the next term.
Thus, 1 + 3 + 4 = 8; 3 + 4 + 8 = 15; 4 + 8 + 15 = 27 and so on.
∴ Missing number = 8 + 15 + 27 = 50.

Question: 3

4, 10, (…..), 82, 244, 730

(A) 218

(B) 77

(C) 28

(D) 24

Ans: C

Each number in the series is the preceding number multiplied by 3 and then decreased by 2.

Question: 4

0.5, 0.55, 0.65, 0.8, (…..)

(A) 1

(B) 0.9

(C) 0.82

(D) 0.95

Ans: A

The pattern is +0.05, 0.10, +0.15, ….
∴ Missing number = 0.8 + 0.20 = 1.

Question: 5

225, 336, 447, (…..), 669, 7710

(A) 991

(B) 558

(C) 338

(D) 114

Ans: B

The first two digits of the numbers in the given series are 22, 33, 44, …., 66, 77. The third digits of the number form the series 5, 6, 7, …, 9, 10.
So, the first two digits of the missing number are 55 and
the third digit is 8.
∴ Missing number is 558.

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