If N be the set of all-natural numbers, consider f : N → N such that f(= 2x, ∀ x ∈ N, then f is
A. one-one onto
B. one-one into
C. many-one onto
D. None of these
Answer:B
If N be the set of all-natural numbers, consider f : N → N such that f(= 2x, ∀ x ∈ N, then f is
A. one-one onto B. one-one into C. many-one onto D. None of these