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Algebra II

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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 ?

  • Algebra II -

    No.
    Sn=8(1-(-1)^9)/(1-(-1))=8*2/2=8

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