2 years ago

What is the sum of the first seven terms of the geometric series where a1 = 10 and r = −2?

Mathematics

1 answer:

lbvjy [14]2 years ago

5 0

Answer:

Step-by-step explanation:

<h3>Given GP with:</h3>

a1 = 10
r = -2

<h3>Solution</h3>

<u>Formula of sum:</u>

Sn = a1(r^n - 1)/(r - 1)

<u>Substitute values:</u>

S7 = 10((-2)^7 - 1)/(-2 - 1) = 10(- 128 - 1)/(-3) = 10*129/3 = 430

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