The value of `sum_(r=1)^(n+1)(sum_(k=1)^n C(k,r-1))=`

The value of sum_(r=1)^(10)r(n C_(r))/(n C_(r-1)) =

The value of sum_(r=1)^(n+1)(sum_(k=1)^n "^k C_(r-1)) ( where r ,k ,n in N) is equal to a. 2^(n+1)-2 b. 2^(n+1)-1 c. 2^(n+1) d. none of these

The value of sum_(r=1)^(n+1)(sum_(k=1)^n "^k C_(r-1)) ( where r ,k ,n in N) is equal to a. 2^(n+1)-2 b. 2^(n+1)-1 c. 2^(n+1) d. none of these

The value of sum_(r=1)^(n+1)(sum_(k=1)^n ^kC_(r-1)) (where r, k, n in N ) is equal to

Find the value of sum_(i=1)^n sum_(i=1)^n sum_(k=1)^n k

Find the value of sum_(i=1)^n sum_(i=1)^n sum_(k=1)^n 1

The value of sum_(r=1)^(n+1)(sum_(k=1)^(k)C_(r-1))( where r,k,n in N) is equal to a.2^(n+1)-2b2^(n+1)-1c.2^(n+1)d. none of these

The value of cot(sum_(n=1)^(23)cot^-1(1+sum_(k=1)^n2k)) is