Number Series

Q1: Look at this series: 80, 10, 70, 15, 60, ... What number should come next?

A 20

B 25

C 30

D 50

ANS:A - 20

This is an alternating addition and subtraction series. In the first pattern, 10 is subtracted from each number to arrive at the next. In the second, 5 is added to each number to arrive at the next.



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