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

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

A

one-one onto

B

one-one into

C

many-one onto

D

None of these

Answer:

The correct option is B. one-one into

Note