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

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.

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

State whether B is a subset of A or not:A = the set of natural numbers B = the set of negative integers

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

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

Check what the result would have been of the sum of chosen number and the number with reversed digits, if Sundaram had chosen the number shown below. 27

Check what the result would have been of the sum of chosen number and the number with reversed digits, if Sundaram had chosen the number shown below. 39