Question

For each natural number, n( n + 1) is multiple of 2.

Answer 1

If you ask why then the reason is that an even number multiplied by an odd number is always and even number, and every even number is divisible by 2

Lets take 7 as n

7(7+1) = 7*8 , 8 is even

Lets take 8 as n

8(8+1) = 8*9, 8 is even