Asked by Neil

20
(Sigma Sign) 2n + 7
k= 1

Answers

Answered by MathMate
∑2n+7
=2∑n + ∑ 7
=2*(20+1)(20/2) + 20*7
=420+140
=560
Answered by Neil
Thank you, MathMate.
Answered by Neil
Wait, do you know how it could be plugged into the Sn= a1 (1 - r^n/ 1 - r) formula?
Answered by MathMate
Sn= a1 (1 - r^n/ 1 - r)
applies when the series is a geometric progression, such as

20
∑ a1*r^i
i=1
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