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# Examine each of the following relations given below and state in each case, giving reasons whether it is a function or not?  (i) R = {(2,1),(3,1), (4,2)}, (ii) R = {(2,2),(2,4),(3,3), (4,4)} (iii) R = {(1,2),(2,3),(3,4), (4,5), (5,6), (6,7)}

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