# 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.

6.

1, 1, 4, 8, 9, 27, 16, ?

 A. 32 B. 64 C. 81 D. 256

Explanation:

The series consists of squares and cubes of consecutive natural numbers i.e. 12, 13, 22, 23, 32, 33, 42, .....

So, missing term = 43 = 64.

7.

1, 2, 3, 6, 9, 18, ?, 54

 A. 18 B. 27 C. 36 D. 81

Explanation:

The pattern is x 2, x 3/2, x 2, x 3/2, x 2,.....

So, missing term = 18 x 3/2 = 27.

8.

6, 13, 25, 51, 101, ?

 A. 201 B. 202 C. 203 D. 205

Explanation:

The pattern is x 2 + 1, x 2 - 1, x 2 + 1, x 2 - 1,.....

So, missing term = 101 x 2 + 1 = 203.

9.

5, 6, 9, 15, ?, 40

 A. 21 B. 25 C. 27 D. 33

Explanation:

The pattern is + 1, + 3, + 6,....., i.e. + 1, + (1 + 2), + (1 + 2 + 3),.....

So, missing term = 15 + (1 + 2 + 3 + 4) = 25.

10.

1, 3, 4, 8, 15, 27, ?

 A. 37 B. 44 C. 50 D. 55

Explanation:

The sum of any three consecutive terms of the series gives the next term.

So, missing number = 8 + 15 + 27 = 50.