Find the sum `sumsum_(0lt=i < jlt=n-1)j^n C_idot`

Find the sum sumsum_(0leiltjlen)"^nC_i

Find the sum sumsum_(0leiltjlen) "^nC_i "^nC_j

Find the sum (sumsum)_(0leiltjlen) ""^(n)C_(i) .

Find the sum sumsum_(i!=j)^n ^nC_i^n C_j

Find the value of sumsum_(0leilejlt=n)(i+j)(nC_i+n C_j)dot

Find the value of sumsum_(0leilejlt=n)c_i^n"" c_j^ndot

Find the value of sumsum_(0leiltjlen) (""^(n)C_(i)+""^(n)C_(j)) .

Find the sumsum_(0leiltjlen)1 .

If (1+x)^n=C_0+C_1x+C_2x^2+……..+C_nx^n then the value of sumsum_(0lt=iltjlt=n)C_iC_j is (A) 2^(2n-1)- .^(2n)C_(n/2) (B) .^(2n)C_n (C) 2^n (D) none of these

Find the value of (sumsum)_(0leiltjlen) (1+j)(""^(n)C_(i)+""^(n)C_(j)) .