If `13C_r` is denoted by `C_r`, then the value of `C_1+C_5+C_7+C_9+C_11` is equal to

The value of 13C_7+13C_8+13C_9+13C_10+13C_11+13C_12+13C_13 is equal to

if 15C_(r):15C_(r-1)=11:5 then find he value of r

If ^100 C_5+5^(100)C_6+10^(100)C_7+10^(100)C_8+5^(100)C_9+^(100)C_(10) has the value equal to ^n C_r , then least value of (n+r) is equal to 200 (2) 195 (3) 115 (4) 105

If C_(r)=10C_(r), then sum_(r=1)^(10)C_(r-1)C_(r) is equal to

If 1/( ^5C_r)+1/( ^6C_r)+1/(~^4C_r) find the value of r.

If .^(15)C_(r): .^(15)C_(R-1) = 11:5 , then find the value of 'r'.

If .^(15)C_(r): .^(15)C_(R-1) = 11:5 , then find the value of 'r'.

If (1)/(.^(5)C_(r))+(1)/(.^(6)C_(r))=(1)/(.^(4)C_(r)) , then the value of r equals to

If C_o C_1, C_2,.......,C_n denote the binomial coefficients in the expansion of (1 + x)^n , then the value of sum_(r=0)^n (r + 1) C_r is