1.

The identity element for the binary operation `**` defined on Q - {0} as `a ** b=(ab)/(2), AA a, b in Q - {0}` isA. 1B. 0C. 2D. None of these

Answer» Correct Answer - C
Given that, `a ** b = (ab)/(2), AA a,b in Q - {0}.`
Let e be the identity element for `**`.
` :. A ** e = (ae)/(2)`
`implies a=(ae)/(2)implies e=2`


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