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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.

Text Solution

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We have `4**5`=L.c.m. of 4 and 5
`=20 in {1,2,3,4,5}
`therefore **` is not a binary operation
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A N EXCEL PUBLICATION-RELATIONS AND FUNCTIONS-QUESTION BANK
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