Series Completion Interview Questions and Answers
Question - 31 : - 6, 11, 21, 36, 56, ?
A. 42
B. 51
C. 81
D. 91
Answer - 31 : -
Option C
Explanation:
The pattern is + 5, + 10, + 15, + 20, ...
So, missing term = 56 + 25 = 81.
Question - 32 : - 563, 647, 479, 815, ?
A. 672
B. 386
C. 279
D. 143
Answer - 32 : -
Option D
Explanation:
The pattern is + 84, - 168, + 336,.....i.e. + 84, - (84 x 2), + (84 x 22), .....
So, missing term = 815 - (84 x 23) = 815 - 672 = 143.
Question - 33 : - 13, 35, 57, 79, 911, ?
A. 1110
B. 1112
C. 1113
D. 1315
Answer - 33 : -
Option C
Explanation:
The terms of the given series are numbers formed by joining together consecutive
odd numbers in order i.e. 1 and 3, 3 and 5, 5 and 7, 7 and 9, 9 and 11, .....
So, missing term = number formed by joining 11 and 13 = 1113.
Question - 34 : - 1, 4, 10, 22, 46, ?
A. 64
B. 86
C. 94
D. 122
Answer - 34 : -
Option C
Explanation:
The pattern is + 3, + 6, + 12, + 24,.....
So, missing term = 46 + 48 = 94.
Question - 35 : - 10, 100, 200, 310, ?
A. 400
B. 410
C. 420
D. 430
Answer - 35 : -
Option D
Explanation:
The pattern is + 90 + 100, + 110,.....
So, missing term = 310 + 120 = 430.
Question - 36 : - 11, 10, ?, 100, 1001, 1000, 10001
A. 101
B. 110
C. 111
D. None of these
Answer - 36 : -
Option A
Explanation:
The pattern is - 1, x 10 + 1, - 1, x 10 + 1, - 1, x 10 + 1, .....
So, missing term = 10 x 10 + 1 = 101.
Question - 37 : - 2, 7, 27, 107, 427, ?
A. 1262
B. 1707
C. 4027
D. 4207
Answer - 37 : -
Option B
Explanation:
The pattern is + 5, + 20, + 80, + 320, ...... i.e. + (5 x 12), + (5 x 22), + (5 x 42), + (5 x 82),.....
So, missing term = 427 + (5 x 162) = 427 + 1280 = 1707.
Question - 38 : - 2, 5, 9, ?, 20, 27
A. 14
B. 16
C. 18
D. 24
Answer - 38 : -
Option A
Explanation:
The pattern is + 3, + 4, + 5, + 6,.....
So, missing term = 9 + 5 = 14.
Question - 39 : - 2, 3, 3, 5, 10, 13, ?, 43, 172, 177
A. 23
B. 38
C. 39
D. 40
Answer - 39 : -
Option C
Explanation:
The pattern is + 1, x 1, + 2, x 2, + 3, x 3, + 4, x 4, + 5.
So, missing term = 13 x 3 = 39.
Question - 40 : - 9, 27, 31, 155, 161, 1127, ?
A. 316
B. 1135
C. 1288
D. 2254
Answer - 40 : -
Option B
Explanation:
The pattern is x 3, + 4, x 5, + 6, x 7,.....
So, missing term = 1127 + 8 = 1135.