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28 April, 00:48

Find the missing number in the following series:

4? 17 51 56 168 i know the answer is 12 (someone else said) but i don't know why. Can anyone explain the pattern?

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  1. 28 April, 01:36
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    Because 4*3=12, 12+5=17, 17*3=51, 51+5 56, 56*3=168.

    The pattern is * 3, + 5, * 3, + 5, ...
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