1.

Show that (2^(2) *C_(0) )/(1*2)+(2^(3)*C_(1))/(2*3)+(2^(4) *C_(2))/(3*4)+…+(2^(n+2)*C_(n))/((n+1)(n+2)) = (3^(n+2) - 2n-5)/((n+1)(n+2)) Hence deduce that(C_(0))/(1.2) -(C_(1))/(2.3) +(C_(2))/(3.4) -…=(1)/(n+2)

Answer»

`(3^(n+2)-2n-5)/((n+1)(n+2))`
`(3^(n+2)+2n+5)/((n+1)(n+2))`
`(3^(n+5) -5N +3)/((n+1)^2)`
none

Answer :A


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