Show that one and only one out of n,n+2 orn+4is divisible by 3 ,where n is any positive integer
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put n=1
then,n+2 is div by 3
put n =2
then,n+4 is div by 3
put n=3
then,n is div by 3
Hence we can say that n,n+2,n+4 is div.by 3
then,n+2 is div by 3
put n =2
then,n+4 is div by 3
put n=3
then,n is div by 3
Hence we can say that n,n+2,n+4 is div.by 3
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