If S=2+6/7+12/7^2+20/7^3+. . . then fin...

If `S=2+6/7+12/7^2+20/7^3+. . . ` then find `4S`

`(7/3)^2`

`7^3/3^2`

`(7/3)^3`

`7^2/3^3`

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