If `C(12,r)= 495` then find the possible values of `r`

The positive integers p,q,&r are all primes if p^(2)-q^(2)=r, then find all possible values of r

The positive integers p,q and r are all primes if p^(2)-q^(2)=r, then find all possible values of r.

The positive integers p,q, and r are all primes if p^(2)-q^(2)=r, then find all possible values of r.

For a in R,cos alpha cos x+sin y>=sin xAA x in R then find the sum of the possible value(s) of sin alpha+sin y

If P(n,r)=990 and C(n,r)=165 then find the value of r

If p^(q')=512 find the minimum possible value of (p) (q) (r) , where p, q, r are positive integers.

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

If a,b,c in R and a^(2)+b^(2)+c^(2)=1, then the possible values of [ab+bc+ca] are

In .^(6)C_(n) what are the possible values of r?