Teaching EMRS PGT Mock Test 2023 Mathematics Relations and Functions Types of Functions

Let N be the set of natural numbers and f : N → N be a function given by f (x) = x + 1 ∀ x ∈ N. Which one of the following is correct?

1
f is one - one and onto
2
f is one - one but not onto
3
f is only onto
4
f is neither one - one nor onto
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