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TIFR-2017-Maths-B: 6

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TIFR-2017-Maths-A: 6
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TIFR-2017-Maths-B: 1
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soujanyareddy13 asked Aug 30, 2020
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Prove or disprove: the group of positive rationals under multiplication is isomorphic to its subgroup consisting of rationals which can be expressed as $p/q$, where both $p$ and $q$ are odd positive integers.
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