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Find the sum to n terms of the following...

Find the sum to n terms of the following series :
`1+2a + 3 a^(2) + 4a^(3) + …, [a != 1]`

Text Solution

Verified by Experts

The correct Answer is:
`(1-a^(n))/((1-a)^(2)) - (na^(n))/(1-a)`
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