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

Examine whether 8^n can end with zero for any 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 variance of first n natural numbers.

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

The sum of first n odd natural number is

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

Examine whether the following functions are one-one and onto : f : N rarrN,f(x)=2x for all x in N

Examine whether the following sequences are in A.P. If it is so, determine its first term and common difference. T_n=4n+3

Examine whether the following sequences are in A.P. If it is so, determine its first term and common difference. T_n=n^2+3