# Verbal Reasoning - Series Completion

### Exercise :: Series Completion - Section 1

Choose the correct alternative that will continue the same pattern and replace the question mark in the given series.

31.

66, 36, 18, ?

 A. 3 B. 6 C. 8 D. 9

Explanation:

Each term in the series is the product of the digits of the preceding term.

So, missing term = 1 x 8 = 8.

32.

In the series 3, 9, 15, ...... what will be the 21st term?

 A. 117 B. 121 C. 123 D. 129

Explanation:

Clearly, 3 + 6 = 9, 9 + 6 = 15,.....

So, the series is an A.P. in which a = 3 and d = 6.

Therefore 21st term = a + (21 - 1) d = a + 20d = 3 + 20 x 6 = 123.

33.

28, 33, 31, 36, ?, 39

 A. 32 B. 34 C. 38 D. 40

Explanation:

The pattern is + 5, - 2, + 5, - 2,.....

So, missing term = 36 - 2 = 34.

34.

1, 9, 25, 49, 81, ?

 A. 100 B. 112 C. 121 D. 144

Explanation:

The series consists of squares of consecutive odd numbers

i.e. 12, 32, 52, 72, 92,.....

So, missing term = 112 = 121.

35.

1, 9, 25, 49, ?, 121

 A. 64 B. 81 C. 91 D. 100

Explanation:

The given series consists of squares of consecutive odd numbers

i.e. 12, 32, 52, 72,.....

So, missing term = 92 = 81.