1.

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.

Answer»

SOLUTION :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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