Prove that one and Only one out of n,n+2 and n+4 is divisible by 3 ,where n is any positive integer

Prove that one and Only one out of n,n+2 and n+4 is divisible by 3 ,wh

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