show that 1 and only 1 out of n,n+4,n+8,n+12 and n+16 is divisible by 5, where n is any positive integer
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put 5 in n,n+4,n+8,,n+12 and n+16
the answer u get is
5,9,13,17 and 21 only 5 is divisible by 5
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