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# Series Completion Interview Questions and Answers

Question - 1 : -
120, 99, 80, 63, 48, ?

A. 35
B. 38
C. 39
D. 40

Answer - 1 : -

Option A

Explanation:

The pattern is - 21, - 19, - 17, - 15,.....

So, missing term = 48 - 13 = 35.

Question - 2 : -
589654237, 89654237, 8965423, 965423, ?

A. 58965
B. 65423
C. 89654
D. 96542

Answer - 2 : -

Option D

Explanation:

The digits are removed one by one from the beginning and the end in order alternately

so as to obtain the subsequent terms of the series.

Question - 3 : -
3, 10, 101,?

A. 10101
B. 10201
C. 10202
D. 11012

Answer - 3 : -

Option C

Explanation:

Each term in the series is obtained by adding 1 to the square of the preceding term.

So, missing term = (101)2 + 1 = 10202.

Question - 4 : -
In the series 2, 6, 18, 54, ...... what will be the 8th term ?

A. 4370
B. 4374
C. 7443
D. 7434

Answer - 4 : -

Option B

Explanation:

Clearly, 2 x 3 = 6, 6 x 3 = 18, 18 x 3 = 54,.....

So, the series is a G.P. in which a = 2, r = 3.

Therefore 8th term = ar8-1 = ar7 = 2 x 37 = (2 x 2187) = 4374.

Question - 5 : -
125,80,45,20,?

A. 5
B. 8
C. 10
D. 12

Answer - 5 : -

Option A

Explanation:

The pattern is - 45, - 35, - 25, .....

So, missing term = 20 - 15 = 5.

Question - 6 : -
13, 32, 24, 43, 35, ?, 46, 65, 57, 76

A. 45
B. 52
C. 54
D. 55

Answer - 6 : -

Option C

Explanation:

The given sequence is a combination of two series:

I. 13, 24, 35, 46, 57 and II. 32, 43, ?, 65, 76

The pattern in both I and II is + 11. So, missing term = 43 + 11 = 54.

Question - 7 : -
22, 24, 28, ?, 52, 84

A. 36
B. 38
C. 42
D. 46

Answer - 7 : -

Option A

Explanation:

The pattern is + 2, + 4, + 8, + 16,.....

So, missing term = 28 + 8 = 36.

Question - 8 : -
3, 15, ?, 63, 99, 143

A. 27
B. 35
C. 45
D. 56

Answer - 8 : -

Option B

Explanation:

The terms of the given series are (22 - 1), (42 - 1),....., (82 - 1), (102 - 1), (122 - 1).

So, missing term = (62 - 1) - (36 - 1) = 35.

Question - 9 : -
90, 180, 12, 50, 100, 200, ?, 3, 50, 4, 25, 2, 6, 30, 3

A. 150
B. 175
C. 225
D. 250

Answer - 9 : -

Option A

Explanation:

Clearly, 90 = 30 x 3, 180 = 6 x 30, 12 = 2 x 6, 50 = 25 x 2, 100 = 4 x 25, 200 = 50 x 4.

So, missing term = 3 x 50 = 150.

Question - 10 : -
48, 24, 96, 48, 192, ?

A. 76
B. 90
C. 96
D. 98

Answer - 10 : -

Option C

Explanation:

The pattern is ÷ 2, x 4, ÷ 2, x 4, .....

So, missing term = 192 ÷ 2 = 96.

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