# Number Series

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

11 14 14 17 17 20 20

**Answer**: (e)

**Explanation:**

This is a simple addition series with repetition. It adds 3 to each number to arrive at the next, which is repeated before 3 is added again.

10 34 12 31 14 28 16

**Answer**: (a)

**Explanation:**

Two patterns alternate here. The first pattern begins with 10 and adds 2 to each number to arrive at the next; the alternating pattern begins with 34 and subtracts 3 each time.

17 14 14 11 11 8 8

**Answer**: (d)

**Explanation:**

In this simple subtraction with repetition series, each number is repeated, then 3 is subtracted to give the next number, which is then repeated, and so on.

17 32 19 29 21 26 23

**Answer**: (c)

**Explanation:**

Here, there are two alternating patterns. The first begins with 17 and adds 2; the second begins with 32 and subtracts 3.

2 44 4 41 6 38 8

**Answer**: (d)

**Explanation:**

Here, there are two alternating patterns, one addition and one subtraction. The first starts with 2 and increases by 2; the second starts with 44 and decreases by 3.

16 26 56 36 46 68 56

**Answer**: (c)

**Explanation:**

Here, every third number follows a different pattern from the main series. In the main 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.

32 29 26 23 20 17 14

**Answer**: (a)

**Explanation:**

In this simple subtraction series, the numbers decrease by 3.

4 7 26 10 13 20 16

**Answer**: (e)

**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.

3 8 10 15 17 22 24

**Answer**: (c)

**Explanation:**

This is an alternating addition series that adds 5, then 2, then 5, and so on.

7 9 66 12 14 66 17

**Answer**: (a)

**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.

32 31 32 29 32 27 32

**Answer**: (a)

**Explanation:**

This is an alternating repetition series. The number 32 alternates with a series in which each number decreases by 2.

34 30 26 22 18 14 10

**Answer**: (d)

**Explanation:**

This is a simple subtraction series, in which 4 is subtracted from each number to arrive at the next.

44 41 38 35 32 29 26

**Answer**: (a)

**Explanation:**

This is a simple subtraction series, in which 3 is subtracted from each number to arrive at the next.

14 14 26 26 38 38 50

**Answer**: (b)

**Explanation:**

In this simple addition with repetition series, each number in the series repeats itself, and then increases by 12 to arrive at the next number.

13 29 15 26 17 23 19

**Answer**: (b)

**Explanation:**

Here, there are two alternating patterns, with every other number following a different pattern. The first pattern begins with 13 and adds 2 to each number to arrive at the next; the alternating pattern begins with 29 and subtracts 3 each time.

3 5 35 10 12 35 17

**Answer**: (c)

**Explanation:**

This is an alternating addition series, with a random number, 35, interpolated as every third number. The pattern of addition is to add 2, add 5, add 2, and so on. The number 35 comes after each "add 2" step/

36 31 29 24 22 17 15

**Answer**: (e)

**Explanation:**

This is an alternating subtraction series, which subtracts 5, then 2, then 5, and so on.

8 12 9 13 10 14 11

**Answer**: (b)

**Explanation:**

This is an alternating addition and subtraction series, in which the addition of 4 is alternated with the subtraction of 3.

6 10 14 18 22 26 30

**Answer**: (e)

**Explanation:**

This simple addition series adds 4 to each number to arrive at the next.

42 40 38 35 33 31 28

**Answer**: (c)

**Explanation:**

This is an alternating subtraction series in which 2 is subtracted twice, then 3 is subtracted once, then 2 is subtracted twice, and so on.

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