# Number Series 3

11) Find the missing numbers in the series, 4, 20, 7, 14, 10, 8, 13, _, _.

1. 2, 18
2. 2, 14
3. 2, 16
4. 2, 15

Explanation:

This is an alternating addition and subtraction series in which 3 is added to each number in the first pattern and 6 is subtracted from each number in the second pattern. Therefore, the next two numbers are 2 (8-6) and 16 (13+3).

12) Find the wrong number in the series, 2, 6, 15, 31, 56, 93.

1. 93
2. 15
3. 31
4. 56

Explanation:

In this series, the difference between the two consecutive numbers is 4, 9, 16, 25, and 37 (22 + 32 + 42 + 52 + 62). So, after 25 there should be 36, not 37, and after 56 there should be 92 (56+36) not 93.

13) 12 12, 24 24, 36 36, 48, _, _?

1. 48 58
2. 48 60
3. 48 62
4. 48 64

Explanation:

In this series, each number repeats itself then increases by 12, so the next two numbers are 48 and 60 (48+12).

14) Find the next two numbers in the series, 52, 50, 48, 44, 42, 40, 36 _, _

1. 33, 31
2. 34, 32
3. 34, 30
4. 32, 30

Explanation:

This is an alternating subtraction series; 2 is subtracted twice, then 4 is subtracted once and so on. Therefore, the next two numbers are 34 and 32.

15) Find the next two numbers in the series 5, 12, 15, 22, 25, 32, _, _.

1. 35, 42
2. 39, 42
3. 42, 35
4. 34, 39

Explanation:

This is an alternating addition series that adds 7 then 3 and so on.

Number Series 1
Number Series 2
Number Series 4

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