**1. Look at this series: 2, 1, (1/2), (1/4), ... What number should come next?**

Answer and Solution :

**(1/8)**

This is a simple division series; each number is one-half of the previous number.

In other terms to say, the number is divided by 2 successively to get the next result.

`4/2 = 2`

2/2 = 1

1/2 = 1/2

(1/2)/2 = 1/4

(1/4)/2 = 1/8 and so on.

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**2. Look at this series: 7, 10, 8, 11, 9, 12, ... What number should come next?**

Answer and Solution :

**10**

This is a simple alternating addition and subtraction series. In the first pattern, 3 is added; in the second, 2 is subtracted.

**3. Look at this series: 36, 34, 30, 28, 24, ... What number should come next?**

Answer and Solution :

**22**

This is an alternating number subtraction series. First, 2 is subtracted, then 4, then 2, and so on.

**4. Look at this series: 22, 21, 23, 22, 24, 23, ... What number should come next?**

Answer and Solution :

**25**

In this simple alternating subtraction and addition series; 1 is subtracted, then 2 is added, and so on.

**5. Look at this series: 53, 53, 40, 40, 27, 27, ... What number should come next?**

Answer and Solution :

**14**

In this series, each number is repeated, then 13 is subtracted to arrive at the next number.