Question

Let f = { (2, 7), (3, 4), (7, 9), (-1, 6), (0, 2), (5, 3) } be a function from A = { -1, 0, 2, 3, 5, 7 } to B = { 2, 3, 4, 6, 7, 9 }. Is this (i) an one-one function (ii) an onto function (iii) both one-one and onto function?

Answer 1

Since no two inputs have the same outputs therefore $f$ is one-one function.

Also $domain=codomain\therefore f$ is onto.