Rational Numbers

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A positive rational number is a real number which can be expressed as P/Q where P, Q are coprime positive intergers. The Chef is very hungry and can get food only if he solves the following question. "Given a number N, find the number of positive rational numbers less than 1 such that when expressed as P/Q, both P, Q are less than or equal to N". Please help the Chef in answering this question. Th

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solution.cppC++17

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