Question

If n is an integer, then every integral multiple of 3 can be represented by the expression ___.

Answer 1

Given n is an integer. If we are to consider positive integers, then n = 1,2,3,4,5....

If we consider the expression '3n', we will have $3\times 1,3\times 2,3\times 3$ and so on.
These numbers are positive multiples of 3.

Thus for any integer n, 3n is an integral multiple of 3.

Thus, 3n will represent an integral multiple of 3.