 # Aptitude - Aptitude-Number Series

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18 21 25 18 29 33 18

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This is a simple addition series with a random number, 18, interpolated as every third number. In the series, 4 is added to each number except 18, to arrive at the next number.

84 78 72 66 60 54 48

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In this simple subtraction series, each  number is 6 less than the previous number.

61 57 50 61 43 36 61

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This is an alternating repetition series, in which a random number, 61, is interpolated as every third number into an otherwise  simple subtraction series. Starting with the second number, 57, each number (except 61)
is 7 less than the previous number.

20 20 17 17 14 14 11

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This is a simple subtraction with repetition series. It begins with 20, which is
repeated, then 3 is subtracted, resulting in 17, which is repeated, and so on.

17 17 34 20 20 31 23

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