evangelenep4971 evangelenep4971

27-03-2020
Mathematics

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

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thistleBranch thistleBranch

27-03-2020

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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