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unique representation in the form -1)*a Every where k E 0,1} and a,b e N with a,b/ 0 and the greatest common divisor of a and

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It is given that every nonzero rational number can be represented uniquely by a triple (k, a, b)E (0,1} x N x N , where a, b nonzero and gcd of a and b is 1. Now the required triples form a subset of O, 1 x N x N . Finite products of \mahtbb{N} with is still countable. Subsets of countable sets are countable, hence the set of triples representing all nonzero rational numbers is countable. Adding one more elements (0) still keeps the set countable. Hence the set of all rational numbers is countable.

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