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Find the identity element in set `Q^+` of all positive rational numbers for the operation * defined by `a*b=(a b)/2` for all `a , b in Q^+dot`

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*defined by `a`*`b=(a b)/2`
Then let `e` be the identity element of `Q+`
`a`*`e=e`*`a=a`for all `a in Q^+`
`a`*`e=a`
`(ae)/2=a`
`e=2`
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