If A={1,2,3...} and N is the set of natural numbers, then check whether A and N are equal?

Find the mean of first n natural numbers .

If X={4^n -3n-1 , n in N} and Y={9(n-1), n in N} , where N is the set of natural numbers, then X uu Y is equal to :

The variance of the first n natural numbers is :

If f : N xx N rarr N is such that f (m,n) = m+n , for all n in N , where N is the set of all natural numbers, then which of the following is true?

Find the sum of first n odd natural numbers.

If A = (x: x = (1)/(y), y in N ), where N is the set of natural numbers , then

Find the sum of first n even natural numbers.

On the set of all natural number N, which one of the following * is a binary operation?

The sum of n natural numbers is 325. find n.

The sum of n natural numbers is 325 . Find n.