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Number Series - Verbal and Reasoning

Directions to SolveIn 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
Q1:

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

A (1/3)

B (1/8)

C (2/8)

D (1/16)

ANS:B - (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.