If the unit digit of `13^(n)+7^(n)-3^(n) n in N` is 7 then the value of n is of the form

If ^(n)C_(5)=^(n)C_(7) ,then the value of n is

If C(n, 7)=C(n, 5) , Find the value of n?

If lim_(x rarr-n)(x^(7)+n^(7))/(x+n)=7, then the value of n is

If P(n-1,3)+P(n+1,3)=(5)/(12) then value of n is

If A={ p in N,p is a prime and p=(7n^(2)+3n+3)/(n) for some n in N ), then the number of elements in the set A is