Find the 7th term and sum up to 7 terms of the GP 3, 6, 12, …
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2
Answer:
Here, a=3,n=7
r=
3
6
=2
Therefore,
S
n
=a(
r−1
r
n
−1
)
S
7
=a(
r−1
r
7
−1
)=3(
2−1
2
7
−1
)=3(128−1)=381
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