If the product of two irrational numbers is rational, then which of the following can be conclud...

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If the product of two irrational numbers is rational, then which of the following can be concluded?
(W)
(a) The ratio of the greater and the smaller numbers is an integer.
(b) The sum of the numbers must be rational.
(c) The excess of the greater irrational number over the smaller irrational number must be rational.
(d) None of these
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