Verbal Reasoning - Series Completion

Directions to Solve

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

1.
120, 99, 80, 63, 48, ?
35
38
39
40
Explanation:

The pattern is - 21, - 19, - 17, - 15,.....

So, missing term = 48 - 13 = 35.

2.
589654237, 89654237, 8965423, 965423, ?
58965
65423
89654
96542
Explanation:

The digits are removed one by one from the beginning and the end in order alternately

so as to obtain the subsequent terms of the series.

3.
3, 10, 101,?
10101
10201
10202
11012
Explanation:

Each term in the series is obtained by adding 1 to the square of the preceding term.

So, missing term = (101)2 + 1 = 10202.

4.
In the series 2, 6, 18, 54, ...... what will be the 8th term ?
4370
4374
7443
7434
Explanation:

Clearly, 2 x 3 = 6, 6 x 3 = 18, 18 x 3 = 54,.....

So, the series is a G.P. in which a = 2, r = 3.

Therefore 8th term = ar8-1 = ar7 = 2 x 37 = (2 x 2187) = 4374.

5.
125,80,45,20,?
5
8
10
12