Examples :- If x,y in {1;2;3;4} ;then wh...

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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