Examine whether `8^n` can end with zero for any n,n belongs to natural number.

Examine whether 6^n can end with five for n,n belongs to natural number.

Check whether 6^n can end with the digit 0 for any natural number n.

Find the sum of first n even natural numbers.

Find the sum of first n terms of even natural numbers .

Find the variance of first n natural numbers.

The sum of first n odd natural number is

What is the sum of the cubes of first n natural numbers?

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)

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) nn (B-A)

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