Question

The mapping f : N → N is given by f(n) = 1 + n², n ∈ N when N is the set of natural numbers is ____________.

Options

• one-one and onto

• onto but not one-one

• one-one but not onto

• neither one-one nor onto

Answer 1

The mapping f: N → N is given by f(n) = 1 + n², n ∈ N when N is the set of natural numbers is one-one but not onto.