Prove that n5/5+n3/3+7n/15 is a natural number by using the principle of mathematical induction.

Dear user,
In the earlier solution we have assumed 7instead of 7n, so that we could not get the right answer.

Regards

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I have asked this question before but the 'answer' i got said that my question was incorrect. I rechecked and finally got the solution. So the question was correct after all... Anyways i am putting up the solution for anyone who might want it. :) 
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