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Prove by mathematical indution: If n is a natural number, then 1/2*3 + 1/3*4 + 1/4*5...

Prove by mathematical indution: If n is a natural number, then 1/2*3 + 1/3*4 + 1/4*5 +....+1/(n +1)(N+2)=n/2n+4

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