Question

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

Answer 1

.

1. 3=1+2=3 (n+2)
2. 6=2+4=6 (n+4)
3. 9=5+4=9 (n+4)
4. 12=8+4=1