# 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.

11.

3, 4, 7, 7, 13, 13, 21, 22, 31, 34, ?

 A. 42 B. 43 C. 51 D. 52

Explanation:

The given sequence is a combination of two series :

I. 3, 7, 13, 21, 31, ? and II. 4, 7, 13, 22, 34

The pattern in I is + 4, + 6, + 8, + 10,.....

The pattern in II is + 3, + 6, + 9, + 12,.....

So, missing term = 31 + 12 = 43.

12.

198, 194, 185, 169, ?

 A. 92 B. 112 C. 136 D. 144

Explanation:

The pattern is - 4, - 9, - 16,.....i.e. - 22, - 32, - 42,.....

So, missing pattern = 169 - 52 = 169 - 25 = 144.

13.

2, 3, 5,7,11,?, 17

 A. 12 B. 13 C. 14 D. 15

Explanation:

Clearly, the given series consists of prime numbers starting from 2. So, the missing

term is the prime number after 11, which is 13.

14.

6, 12, 21, ?, 48

 A. 33 B. 38 C. 40 D. 45

Explanation:

The pattern is + 6, + 9, + 12, + 15, .....

So, missing term = 21 + 12 = 33.

15.

Which term of the series 5, 10, 20, 40, ..... is 1280?

 A. 10th B. 9th C. 8th D. None of these

Explanation:

Clearly, 5 x 2 = 10, 10 x 2 = 20, 20 x 2 = 40,.....

So, the series is a G.P. in which a = 5 and r = 2.

Let 1280 be the rath term of the series.

Then, 5x2n-1 = 1280 2n-1 = 256 = 28 n - 1 = 8 n = 9.