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Which of the following relations are fun...

Which of the following relations are functions? Give reasons. If it is a function, determine its domain and range.
(i) {(2,1),(5,1),(8,1),(11,1),(14,1),(17,1)}
(ii) {(2,1),(4,2),(6,3),(8,4),(10,5),(12,6),(14,7)}
(iii) {(1,3),(1,5),(2,5)}

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