Let Q be the set of all rational numbers, for each one of the following two cases, give an example of function f: Q → Q. Show your examples satisfy the conditions. (a). one-to-one but not onto (b)....

Discrete Math: Let ℚ be the set of all rational numbers, for each one of the following two cases, give an example of function ?: ℚ→ℚ. Show your examples satisfy the conditions. (screenshot)
(a). one-to-one but not onto
(b). onto but not one-to-one

Extracted text: Let Q be the set of all rational numbers, for each one of the following two cases, give an example of function f: Q → Q. Show your examples satisfy the conditions. (a). one-to-one but not onto (b). onto but not one-to-one