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https://www.meritnation.com/discuss/question/1168811/q-using-the-principle-of-mathematical-induction-prove-that-n55-n33-7n15-is-a-natural-number-v-nen

here, i did not understand how 7k+1 / 15 has been split.......

Also right Q :

Q. Using the principle of mathematical induction, prove that n5/5 + n3/3 + 7n/15 is a natural numberV n E N.

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