Asked by felix
evaluate each geometric series described
21) -3 + 15 - 75 + 375..., n=6
22) 1 + 5 + 25 + 125..., n=8
21) -3 + 15 - 75 + 375..., n=6
22) 1 + 5 + 25 + 125..., n=8
Answers
Answered by
oobleck
r = -5
r = 5
You can tell what a is, and now
Sn = a(r^n - 1)/(r-1)
so just plug in your numbers
r = 5
You can tell what a is, and now
Sn = a(r^n - 1)/(r-1)
so just plug in your numbers
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