# Number Series Questions and Answers Home > Numerical Tests > Number Series > Number Series Questions Look carefully for the pattern, and then choose which pair of numbers comes next.

28 25 5 21 18 5 14

A. 11 5
B. 10 7
C. 11 8
D. 5 10
E. 10 5

Explanation: This is an alternating subtraction series with the interpolation of a random number, 5, as every third number. In the subtraction series, 3 is subtracted, then 4, then 3, and so on. 8 11 21 15 18 21 22

A. 25 18
B. 25 21
C. 25 29
D. 24 21
E. 22 26

Explanation: This is an alternating addition series, with a random number, 21, interpolated as every third number. The addition series alternates between adding 3 and adding 4. The number 21 appears after each number arrived at by adding 3.  9 16 23 30 37 44 51

A. 59 66
B. 56 62
C. 58 66
D. 58 65
E. 54 61

Explanation: Here is a simple addition series, which begins with 9 and adds 7. 2 8 14 20 26 32 38

A. 2 46
B. 44 50
C. 42 48
D. 40 42
E. 32 26

Explanation: This is a simple addition series, which begins with 2 and adds 6. 9 11 33 13 15 33 17

A. 19 33
B. 33 35
C. 33 19
D. 15 33
E. 19 21

Explanation: In this alternating repetition series, a random number, 33, is interpolated every third number into a simple addition series, in which each number increases by 2.  #### Square and Cubic Conversion

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