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May 28, 2015

Homework Help: Algebra II

Posted by anonymous on Monday, April 18, 2011 at 8:52am.

find Sn for geometric sequence with A1 = 8, n = 9, and r = -1

Sn = A1 = 8, n = 9 and r = -1

Sn = A1(1-r^n) / 1-r
= 8(1 - 1^-1)/(1-(-1))
= 8(0)/2
= 0

is this right ?

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