# number series logical reasoning questions

Look carefully for the pattern, and then choose which pair of numbers comes next.
11.

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 series adds 2, then 3, then 2, and so on, with 66 repeated after each “add 2” step.
12.

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.
13.

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 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.
14.

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.