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Prove the following by using the princip...

Prove the following by using the principle of mathematical induction for all `n in N`
`(1)/(1.2.3) + (1)/(2.3.4) + (1)/(3.4.5) + ……+ (1)/(n(n+1)(n+2)) = (n(n+3))/(4(n+1)(n+2))`

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