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(i) Each element of A is the first element of the order pair of `f` and no two pairs of `f` has the same first element, therefore `f: A to B` is a function. <br> (ii) Two order pairs (1,2) and (1,3) of g has the same first element, therefore g is not a function. <br> (iii) `3 in A ` has no image in h, therefore h is not a function.**What is function ?**

**Examples :- If `x,y in {1;2;3;4}` ;then which of the following are function in the given set ? `(a) f_1={(x;y):y=(x+1)} (b) f_2={(x;y):x+y>4} (c) f_3={(x,y):y`
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