Asked by anonymous
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 ?
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 ?
Answers
Answered by
Mgraph
No.
Sn=8(1-(-1)^9)/(1-(-1))=8*2/2=8
Sn=8(1-(-1)^9)/(1-(-1))=8*2/2=8
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