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For r=0,1,2---n then 2.C(0)+7.C(1)+12.C(...

For `r=0,1,2---n` then `2.C_(0)+7.C_(1)+12.C_(2)+----+(5n+2)*C_(n)=`
`(5n+2)2^(n-1)`
`(5n+3)2^(n)`
`(5n+3)2^(n+1)`
`(5n+4)2^(n-1)`

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