3 years ago

Find the sum of the geometric sequence 3, 15, 75, 375, … when there are 9 terms and select the correct answer below.

Mathematics

1 answer:

jeka943 years ago

3 0

Answer:

c. 1,464,843

Step-by-step explanation:

The sum of n terms of a geometric sequence with first term a1 and common ratio r is given by ...

sn = a1(r^n -1)/(r -1)

Filling in the values a1=3, r=5, n=9, we get ...

s9 = 3(5^9 -1)/(5 -1) = 1,464,843

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