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Problem 3. Prove by induction that 1/ (1 · 3 )+ 1 /(3 · 5 )...

Problem 3. Prove by induction that 1/ (1 · 3 )+ 1 /(3 · 5 ) + · · · + 1 /(2n − 1) · (2n + 1) = n / 2n + 1 .

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