Number of elements in set of value of `r` for which, `18C_(r-2)+2* 18C_(r-1)+ 18C_r>=20C_13` satisfied

Element in set of values of r for which,18C_(r-2)+2.18C_(r-1)+18C_(r)>=20C_(13) is :

Set of values of r for which, .^(18)C_(r-2)+2.^(18)C_(r-1)+ ^(18)C_(r) ge .^(20)C_(13) contains

Set of value of r for which C(18,r-2)+2 C(18, r-1)+C(18,r)>=C(20,13) contains

The number of values in set of values of r for which ^(^^)23C_(r)+2.^(23)C_(r+1)+^(23)C_(r+2)>=^(25)C_(15) is

The number of values in set of values of r for which ^23 C_r+2.^(23)C_(r+1)+^(23)C_(r+2)geq^(25)C_(15) is

The number of values in set of values of r for which ^ (23) C_r+2.^(23)C_(r+1)+^(23)C_(r+2)geq^(25)C_(15) is

If 20C_(r) = 20C_(r-10) than 18C_(r)=

The number of values in set of values of r for which ""^23 C_r+2 ""^(23)C_(r+1)+ ""^(23)C_(r+2)ge ""^(25)C_(15) is

If ^18C_r=^18C_(r+2) find rC_5