Verbal Reasoning - Series Completion

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

Answer: Option C

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

Answer: Option C

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

Answer: Option B

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

Answer: Option C

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

Answer: Option B

Explanation:

The given series consists of squares of consecutive odd numbers

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

So, missing term = 92 = 81.