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Let * be a binary operation on set Q of rational numbers defined as

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Let * be a binary operation on set Q of rational numbers defined as a * b = \(\frac{a b}{5}\). Write the identity for *.
(a) 5
(b) 3
(c) 1
(d) 6

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answer is a) 5

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If the binary operation * is defind on the set Q+ of all positive rational numbers by a * b
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