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Find the sum to n terms of the series : ...

Find the sum to n terms of the series :
`1+ (1+4) +(1+4+4^(2)) + (1+4+4^(2) + 4^(3))+…`

Text Solution

Verified by Experts

The correct Answer is:
`(4)/(9)(4^(n)-1) - (n)/(3)`
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