Find the sum of a finite geometric sequence from n = 1 to n = 7, using the expression −4(6)n − 1.


Asked by maham237 @ in Mathematics viewed by 310 People


Find the sum of a finite geometric sequence from n = 1 to n = 7, using the expression −4(6)^n − 1.
a. 111,325
b. 526
c. 782
d. -22,948

Answered by maham237 @



Now we know what the common ratio is, 6, and what the first term is, -4,
and our nth term is 7, since we're asked to do the sum
from 1 to 7.
S7= - 4(1-6(7)/(1-6))
=-223948

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