Find the sum of the first 8 terms of the sequence: -5. 15, -45, 135, .......
1 answer:
Sum of geometric sequence
for the sum where the initial value is a₁ and the common ratio is r and the term is n

common ratio is -3
-5 times -3 is 15, -15 times -3=-45 etc
first term is -5
and we want the 8th term





the sum is 8200
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