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Let A={-1,0,1,2}andB={2,3,4,5}. Find whi...

Let `A={-1,0,1,2}andB={2,3,4,5}`. Find which of the following are functions from A to B. Given reason.
(i) `f={(-1,2),(-1,3),(0,4),(1,5)}`
(ii) `g={(0 ,2),(1,3),(2,4)}`
(iii) `h={(-1,2),(0,3),(1,4),(2,5)}`

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