Asked by Leeto

Write the geometric series 9+3+1..... to 130 term in sigma notation
Answered by oobleck
130
∑ 3^(3-k)
k=1
Answered by Reiny
The general term is 3^(3 - n)

so ∑ (3)^(3-n) , were n = 1 to 130
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