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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: 21, 9, 21, 11, 21, 13, 21, ... What number should come next?

A 14

B 15

C 21

D 23

ANS:B - 15

In this alternating repetition series, the random number 21 is interpolated every other number into an otherwise simple addition series that increases by 2, beginning with the number 9.