# Number Series Questions and Answers

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

28 25 5 21 18 5 14

### Answer & Explanation:

Answer: Option A

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

### Answer & Explanation:

Answer: Option B

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

### Answer & Explanation:

Answer: Option D

Explanation: Here is a simple addition series, which begins with 9 and adds 7.

2 8 14 20 26 32 38

### Answer & Explanation:

Answer: Option B

Explanation: This is a simple addition series, which begins with 2 and adds 6.

9 11 33 13 15 33 17

### Answer & Explanation:

Answer: Option A

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.

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