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

7 9 66 12 14 66 17

A. 19 66
B. 66 19
C. 19 22
D. 20 66
E. 66 20

Explanation: This is an alternating addition series with repetition, in which a random number, 66, is interpolated as every third number. The regular number series adds 2, then 3, then 2, and so on, with 66 repeated after each "add 2" step. 3 8 10 15 17 22 24

A. 26 28
B. 29 34
C. 29 31
D. 26 31
E. 26 32

Explanation: This is an alternating addition series that adds 5, then 2, then 5, and so on.  4 7 26 10 13 20 16

A. 14 4
B. 14 17
C. 18 14
D. 19 13
E. 19 14

Explanation: Two patterns alternate here, with every third number following the alternate pattern. In the main number series, beginning with 4, 3 is added to each number to arrive at the next. In the alternating series, beginning with 26, 6 is subtracted from each number to arrive at the next. 32 29 26 23 20 17 14

A. 11 8
B. 12 8
C. 11 7
D. 32 29
E. 10 9

Explanation: In this simple subtraction series, the numbers decrease by 3. 16 26 56 36 46 68 56

A. 80 66
B. 64 82
C. 66 80
D. 78 68
E. 66 82

Explanation: Here, every third number follows a different pattern from the main series. In the main number series, beginning with 16, 10 is added to each number to arrive at the next. In the alternating series, beginning with 56, 12 is added to each number to arrive at the next.  #### Square and Cubic Conversion

The largest provider of tests on the web. We have thousands of questions covering

numerical and verbal aptitude tests, diagrammatic and logic tests, reasoning tests,

puzzles, general knowledge test questions and GMAT test advice and questions.

No login required. All tests are free. All the tests you need when you need them.