In each series, look for the degree and direction of change between the numbers. In other words, do the numbers increase or decrease, and by how much

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

- (1/3)
- (1/8)
- (2/8)
- (1/16)

Answer: Option B

Explanation:

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.

- Look at this series: 53, 53, 40, 40, 27, 27, … What number should come next?

- 12
- 14
- 27
- 53

Answer: Option B

Explanation:

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

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