Can the number `6^n`, n being a natural number, end with the digit 5? Give reason.

Find the sum of first n even natural numbers.

Find the mean of first n natural numbers .

For a natural number n which one is the correct statement?

Consider the numbers of the form 4^n where n is a natural number. Check whether there is any value of n for which 4^n ends with zero?

Find the sum of first n odd natural numbers.

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

The variance of the first n natural numbers is :

Total number of 6-digit numbers in which all the odd digit appear 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?

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