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.


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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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