The value of `sum_(r=0)^(n-1)(nC_r)/(nC_r+^n C_(r+1))` is eqaul to

The value of sum_(r=0)^(n-1) (""^nC_r)/(""^nC_r+ ""^n C_(r+1)) equals a. n+1 b. n/2 c. n+2 d. none of these

The value of sum_(r=0)^(3n-1)(-1)^(r)6nC_(2r+1)3^(r) is

The value of sum_(r=0)^(3n-1)(-1)^r 6nC_(2r+1)3^r is

If sum_(r=0)^(n-1)(("^nC_r)/(^nC_r+^nC_(r+1)))^3=4/5 then n=

sum_(r=0)^n(-2)^r*(nC_r)/((r+2)C_r) is equal to

sum_(r=1)^(10) r. (""^nC_r)/(""^nC_(r-1)) =

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

The value of sum_(r=1)^n(sum_(p=0)^(r-1) ^nC_r ^rC_p 2^p) is equal to

The value of sum_(r=1)^n(sum_(p=0)^(r-1) ^nC_r ^rC_p 2^p) is equal to (a) 4^(n)-3^(n)+1 (b) 4^(n)-3^(n)-1 (c) 4^(n)-3^(n)+2 (d) 4^(n)-3^(n)

The value of sum_(r=1)^n(sum_(p=0)^(r-1) ^nC_r ^rC_p 2^p) is equal to (a) 4^(n)-3^(n)+1 (b) 4^(n)-3^(n)-1 (c) 4^(n)-3^(n)+2 (d) 4^(n)-3^(n)