It is the sum of the first 12 terms of the sequence 36, 72, 144, 288.*

a. 147, 455
b. 147, 456
c. 147, 457
d. 147, 458
e. none of these


Determine the sum of the first 15 terms of the geometric sequence 5, 10, 20, 40.

a. 163, 840
b. 163, 850
c. 163, 860
d. 163, 870
e. none of these​

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