2C0+2^2/2 C1+2^3/3 C2+.............+2^11...

`2C_0+2^2/2 C_1+2^3/3 C_2+.............+2^11/11 C_10 =?`

`(3^(11))/(11)`

`(3^(11)+1)/(11)`

`(3^(11)-1)/(11)`

`(3^(10)-1)/(10)`

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