`sum_(r=1)^15 r(.^(15)C_r)/(.^15C_(r-1))`

The value of sum_(r = 1)^15 r^2 ((""^15C_r)/(""^15C_(r - 1)) ) of is equal to

The value of sum_(r = 1)^15 r^2 ((""^15C_r)/(""^15C_(r - 1)) ) of is equal to

Find the sum sum_(r=1)^n r^2(^n C_r)/(^n C_(r-1)) .

Let C_r = ""^(15)C_(r), 0ler <=15 . Sum of the series S=sum_(r=1)^(15)r(C_(r))/(C_(r-1)) is

If (1+x) ^(15) =a_(0) +a_(1) x +a_(2) x ^(2) +…+ a_(15) x ^(15), then the value of sum_(r=1) ^(15) r . (a_(r))/(a _(r-1)) is-

If (1+x) ^(15) =a_(0) +a_(1) x +a_(2) x ^(2) +…+ a_(15) x ^(15), then the value of sum_(r=1) ^(15) r . (a_(r))/(a _(r-1)) is-

Let P=sum_(r=1)^50 (^(50+r)C_r(2r-1))/(^50C_r(50+r)),Q=sum_(r=0)^50(^50C_r)^2,R=sum_(r=0)^100(-1)^r(^100C_r)^2

Find the sum of sum_(r=1)^n(r^n C_r)/(n C_(r-1) .

The value of sum_(r=0)^(15)r^(2)((""^(15)C_(r))/(""^(15)C_(r-1))) is equal to