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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