1.

Find the sum to n terms of3 * 2 + 5*2^2 + 7*2^3 + ….

Answer»

`2^(N+2) - 2^(n+1)-2`
`n* 2^(n+2) - 2^(n+1) + 2`
`n*2^(n+2) + 2^(n-2)`
NONE of these

Answer :B


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