Number Series Questions and Answers


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Look carefully for the pattern, and then choose which pair of numbers comes next.

2 3 4 5 6 4 8


A. 9 10
B. 4 8
C. 10 4
D. 9 4
E. 8 9

Answer & Explanation:

Answer: Option D

Explanation: This is an alternating addition series with a random number, 4, interpolated as every third number. In the main series, 1 is added, then 2 is added, then 1, then 2, and so on.



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17 17 34 20 20 31 23


A. 26 23
B. 34 20
C. 23 33
D. 27 28
E. 23 28

Answer & Explanation:

Answer: Option E

Explanation: This is an alternating subtraction series with repetition. There are two different patterns here. In the first, a number repeats itself; then 3 is added to that number to arrive at the next number, which also repeats. This gives the series 17, 17, 20, 20, 23, and so on. Every third number follows a second pattern, in which 3 is subtracted from each number to arrive at the next: 34, 31, 28.



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6 20 8 14 10 8 12


A. 14 10
B. 2 18
C. 4 12
D. 2 14
E. 14 14

Answer & Explanation:

Answer: Option D

Explanation: This is an alternating addition and subtraction series. In the first pattern, 2 is added to each number to arrive at the next; in the alternate pattern, 6 is subtracted from each number to arrive at the next.



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21 25 18 29 33 18


A. 43 18
B. 41 44
C. 37 18
D. 37 41
E. 38 41

Answer & Explanation:

Answer: Option D

Explanation: This is a simple addition series with a random number, 18, interpolated as every third number. In the series, 4 is added to each number except 18, to arrive at the next number.



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75 65 85 55 45 85 35


A. 25 15
B. 25 85
C. 35 25
D. 85 35
E. 25 75

Answer & Explanation:

Answer: Option B

Explanation: This is a simple subtraction series in which a random number, 85, is interpolated as every third number. In the subtraction series, 10 is subtracted from each number to arrive at the next.



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