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Prove that by using the principle of ma...

Prove that by using the principle of mathematical induction for all `n in N`:
`1.3+3.5+5.7+....+(2n-1)(2n+1)= (n(4n^(2)+6n-1))/(3)`

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UNITED BOOK HOUSE-ANNUAL EXAMINATION QUESTION PAPERS 2015-EXERCISE
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