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Example 11 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)} The first elements are 2, 3 and 4 All these are not repeating. Hence, they have unique images. So, this relation is a function. In function, first element is not repeating
