Crey | If A = [1, 2, 3}, B = {5, 6, 7} and f: A → B is a function such that f(x) = x + 4 then what type of function is f? into, one-one onto, many-onto, constant function

Question

If A = [1, 2, 3}, B = {5, 6, 7} and f: A → B is a function such that f(x) = x + 4 then what type of function is f?

Options :

into
one-one onto
many-onto
constant function

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