Question

27.
Prove that one and only one out of n, n +2 and n + 4 is divisible by 3, where n is any positive integer.​

Answer 1

n =3,4and5

if we take n as 3 and divide by 3 it will come 1

n+2=4+2=6,6/3=2

n+4=5+4=9,9/3=3

hence proved it is consecutive