diamondbaby38 diamondbaby38

23-05-2019
Mathematics

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What is the sum of the first 6 terms of the series
-1+4-16+...

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jcherry99 jcherry99

23-05-2019

Answer:

819

Step-by-step explanation:

Givens

a = -1
r = - 4
n = 6

Formula

Sum = a(1 - r^n) / ( 1 - r)

Sum = -1(1 - (-4)^6 / (1 - -4)

Sum = -1 (1 - 4096) / 5

Sum = -1 (- 4095 ) / 5

Sum = 819

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