Question

If N be the set of all-natural numbers, consider f: N → N such that f(x) = 2x, ∀ x ∈ N, then f is ____________.

Options

• one-one onto

• one-one into

• many-one onto

• None of these

Answer 1

If N be the set of all natural numbers, consider f: N → N such that f(x) = 2x, ∀ x ∈ N, then f is one-one into.