Verbal Reasoning - Series Completion

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

41. 

2,3,8,27, 112,?

A. 226
B. 339
C. 452
D. 565

Answer: Option D

Explanation:

The pattern is x 1 + 1, x 2 + 2, x 3 + 3, x 4 + 4,.....

So, missing term = 112 x 5 + 5 = 565.


42. 

6, 17, 39, 72, ?

A. 83
B. 94
C. 116
D. 127

Answer: Option C

Explanation:

The pattern is + 11, + 22, + 33, .....

So, missing term = 72 + 44 = 116.


43. 

20, 20, 19, 16, 17, 13, 14, 11, ?, ?

A. 10, 10
B. 10, 11
C. 13, 14
D. 13, 16

Answer: Option A

Explanation:

Let the missing terms of the series be x1 and x2.

Thus, the sequence 20, 20, 19, 16, 17, 13, 14, 11, xv x2 is a combination of two series :

I. 20, 19, 17, 14, x1 and II. 20, 16, 13, 11, x2

The pattern in I is - 1, - 2, - 3,......So, missing term, x1 = 14 - 4 = 10.

The pattern in II is - 4, - 3, - 2,......So, missing term, x2 = 11 - 1 = 10.


44. 

24, 60, 120, 210, ?

A. 300
B. 336
C. 420
D. 525

Answer: Option B

Explanation:

The pattern is + 36, + 60, + 90,.....i.e. + [6 x (6 + 0)], + [6 x (6 + 4)], + [6 x (6 + 9)],...

So, missing term = 210 + [6 x (6 + 15)] = 210 + 126 = 336.


45. 

625, 5, 125, 25, 25, ?, 5

A. 5
B. 25
C. 125
D. 625

Answer: Option C

Explanation:

The given sequence is a combination of two series :

I. 625, 125, 25, 5 and II. 5, 25, ?

The pattern in I is ÷ 5, while that in II is x 5. So, missing term = 25 x 5 = 125.