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Question: question no5 and 7...

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2 f) Explain why these steps show that this formula is true whenever n is a positive integer. 5. Prove that 12 +32+52 ++(2n+1)2-(n+ 1) (2n +1)(2n +3)/3 whenever n is a nonnegative integer. 6. Prove that 1.11+2-2! + +n.n! = (n + 1)!--1 step of whenever n is a positive integer. 7. Prove that 3 + 3-5 + 3-52+-.. +3 . 5-3 (5n +1-|)/4 р ? whenever n is a nonnegative integer. 8. Prove that 2-2-7 + 2-72-, it +2(-7): (L- re you 7)n+1)/4 whenever n is a nonnegative integer.

question No5 and 7

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