Can there exist natural numbers m and n for which `15^m` `16^n` can end with zero?

Find the variance of first n natural numbers.

Find the sum of first n even natural numbers.

The sum of first n odd natural number is

If n is a any natural number ,then 6^n-5^n is always end with

If the mean of first n natural numbers is (5n)/2 then the value of n will be

Examine the following rational numbers can be put in the form of 2^m 5^n where m and n are both integers. 4.628452

Examine the following rational numbers can be put in the form of 2^m 5^n where m and n are both integers. 2.04bar67

Examine the following rational numbers can be put in the form of 2^m 5^n where m and n are both integers. 1.125

If the mean of first n odd natural number is n^2/81 then the value of n will be

If A = { x : x = 4n + 1 , n is a natural number le 5 } and B = {3n : n is a natural number le 6 } then find (A-B) uu (B-A)