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If the given relation a fucntion? Give r...

If the given relation a fucntion? Give reason for your answer.
(i) `h={(4,6),(3,9),(-11,6),(3,11)}`
(ii) `f={(x,x)|x` is a real number }
(iii) `g={(x,(1)/(x))x` is a positive integer}
(iv) `s={(x,x^(2))|x` is positive integer}
(v) t={(x,3)|x is a real number}

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