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April 18, 2015

April 18, 2015

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

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 ?

- Algebra II -
**Mgraph**, Monday, April 18, 2011 at 9:36amNo.

Sn=8(1-(-1)^9)/(1-(-1))=8*2/2=8

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