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2 January, 13:52

What is the sum of the first 7 terms of the series - 4+8-16+32 - ... ?

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  1. 2 January, 17:07
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    The terms appear to increase by a multiple of - 2. The first 7 terms are:

    -4 + 8 + - 16 + 32 + - 64 + 128 + - 256. Add these together.

    The sum of these numbers is - 172.
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