R={(1,2),(2,1),(3,1),(4,1)} explain. if this Relation is a function or not.
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Answer:no this relation is not a function. Because a function give only one result at a given point.it can't repeat its value . In the above relation function repeat its value i.e it give 1 at point 2,3and4. In other words there is no one to one correspondence.
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