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Examine each of the following relations ...

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

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is function
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