Q 1137256182.     Find the sum `S_n = 1 + 5 + 19 + 65 + ……..`

A

`(3^(n+1)−2^(n+1)−1)/2`

B

`(3^(n+1)−2^(n+2)+1)/2`

C

`(3^(n+1)−2^(n+3)+1)/2`

D

`(3^(n+1)+2^(n+1)−1)2`

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