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Answer to this question prove by induction

Answer to this question prove by induction-example-1
User Prilia
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Answer:

solution:
Sn= (a_(1) (1-q^(n) ))/((1-q)) = (1(1-4^(n)) )/(1-4) = (4^(n)-1 )/(3)

Explanation:

This is a geometric series. Common ratio is 4.

User Leofu
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