# Aptitude - Aptitude-Number Series

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Consider the series given below:
4/12/95,1/1/96,29/1/96,26/2/96,..........
The next term of the series is

• • • • a
• b
• c
• d

9 12 11 14 13 16 15

• • • • a
• b
• c
• d

This is a simple alternating addition and subtraction series. First, 3 is added, then 1 is subtracted, then 3 is added, 1 subtracted, and so on.

6 20 8 14 10 8 12

• • • • a
• b
• c
• d

This is an alternating addition and subtraction series. In the first pattern, 2
is added to each number to arrive at the next; in the alternate pattern, 6 is
subtracted from each number to arrive at the next.

9 11 33 13 15 33 17

• • • • a
• b
• c
• d

In this alternating repetition series, a  random number, 33, is interpolated every third number into a simple addition series, in which each number increases by 2.

9 16 23 30 37 44 51

• • • • a
• b
• c
• d