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Consider an operation ** defined on the ...

Consider an operation `**` defined on the set
`A={1,2,4,8}` by `a**b=LCM` of a and b.
Show that `**` is a binary operation.

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4 * 5=20 notin{1,2,3,4,5}.
.:. *. is not a binary operątion.
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V PUBLICATION-RELATIONS AND FUNCTIONS-QUESTION BANK
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