Question

# 19. If m and n are two positive integers and (m,n) is an even number, by which of the following (mt -n') is always divisible? (1) 2 (2) 8 (3) 4 (4) 12

Solution

19. (3) Since, (m-n) is an even number.
therefore m and n both are either even or odd.
And then (m+ n) is even.
Now, (m2-n2)=(m+ n)x(m-n)
Which is the multiplication of two even numbers
and therefore always be divisible by 4.