[" 28."C(1)+2C(2)*a+3*C(3)*a^(2)+..........

[" 28."C_(1)+2C_(2)a+3C_(3)a^(2)+............+2nC_(2n)*a^(2n-1)=],[" 1) "n(1+a)^(n-1)," 2) "n(1+a)^(n)],[" 3) "2n(1+a)^(2n-1)," 4) "2n(1+a)^(2n)]

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If n>=2 then 3.C_(1)-4.C_(2)+5.C_(3)-.........+1)^(n-1)(n+2)*C_(n)=

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