Number Series Interview Questions and Answers
Question - 11 : - Look at this series: 21, 9, 21, 11, 21, 13, 21, ... What number should come next?
A. 14
B. 15
C. 21
D. 23
Answer - 11 : -
B) 15
Explanation:
In this alternating repetition series, the random number 21 is interpolated every other number into an otherwise simple addition series that increases by 2, beginning with the number 9.
Question - 12 : - Look at this series: 58, 52, 46, 40, 34, ... What number should come next?
A. 26
B. 28
C. 30
D. 32
Answer - 12 : -
B) 28
Explanation:
This is a simple subtraction series. Each number is 6 less than the previous number.
Question - 13 : - Look at this series: 3, 4, 7, 8, 11, 12, ... What number should come next?
A. 7
B. 10
C. 14
D. 15
Answer - 13 : -
D) 15
Explanation:
This alternating addition series begins with 3; then 1 is added to give 4; then 3 is added to give 7; then 1 is added, and so on.
Question - 14 : - Look at this series: 8, 22, 8, 28, 8, ... What number should come next?
A. 9
B. 29
C. 32
D. 34
Answer - 14 : -
D) 34
Explanation:
This is a simple addition series with a random number, 8, interpolated as every other number. In the series, 6 is added to each number except 8, to arrive at the next number.
Question - 15 : - Look at this series: 31, 29, 24, 22, 17, ... What number should come next?
A. 15
B. 14
C. 13
D. 12
Answer - 15 : -
A) 15
Explanation:
This is a simple alternating subtraction series, which subtracts 2, then 5.
Question - 16 : - Look at this series: 80, 10, 70, 15, 60, ... What number should come next?
A. 20
B. 25
C. 30
D. 50
Answer - 16 : -
A) 20
Explanation:
This is an alternating addition and subtraction series. In the first pattern, 10 is subtracted from each number to arrive at the next. In the second, 5 is added to each number to arrive at the next.
Question - 17 : - Look at this series: 2, 6, 18, 54, ... What number should come next?
A. 108
B. 148
C. 162
D. 216
Answer - 17 : -
C) 162
Explanation:
This is a simple multiplication series. Each number is 3 times more than the previous number.
Question - 18 : - Look at this series: 5.2, 4.8, 4.4, 4, ... What number should come next?
A. 3
B. 3.3
C. 3.5
D. 3.6
Answer - 18 : -
D) 3.6
Explanation:
In this simple subtraction series, each number decreases by 0.4.
Question - 19 : - Look at this series: 8, 6, 9, 23, 87 , ... What number should come next?
A. 128
B. 226
C. 324
D. 429
Answer - 19 : -
D) 429
Explanation:
8 x 1 - 2 = 6
6 x 2 - 3 = 9
9 x 3 - 4 = 23
23 x 4 - 5 = 87
87 x 5 - 6 = 429 ..
Question - 20 : - Look at this series: 1.5, 2.3, 3.1, 3.9, ... What number should come next?
A. 4.2
B. 4.4
C. 4.7
D. 5.1
Answer - 20 : -
C) 4.7
Explanation:
In this simple addition series, each number increases by 0.8.