Teaching DSSSB TGT Mock Test 2025 Mathematics Relations and Functions

Which of the following functions, f: R → R is one-one?

1
f(x) = |x|, ∀ x ∈ R
2
f(x) = x2, ∀ x ∈ R
3
f(x) = - x, ∀ x ∈ R
4
None of these
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