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https://www.meritnation.com/ask-answer/question/3-2n-7-is-divisible-by-8-for-all-n-belongs-to-n-using-pmi/mathematical-induction/11067023
https://www.meritnation.com/ask-answer/question/2-7n-3-5n-5-is-divisible-by-24-for-all-n-belongs-to-n/principle-of-mathematical-induction/417678