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What is the sum of the geometric sequence 1, 3, 9, ... if there are 14 terms? (5 points)

What is the sum of the geometric sequence 1, 3, 9, ... if there are 14 terms? (5 points)
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1 vote
What is the sum of the geometric sequence 1, 3, 9, ... if there are 14 terms? (5 points)

User AJStacy
by
8.7k points

1 Answer

5 votes

Answer:

287

Explanation:

the formulae is Sn=n\2(2a+(n-1)d)

where n=14,

d=3

and a=1

therefore,

Sn=14\2(2*1+(14-1)3)

Sn=7(2+(13)3)

Sn=7(2+39)

Sn=7(41)

Sn=287

User WayneC
by
8.3k points
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