Let $f: \mathbb{R} \to \mathbb{R}$ be defined by $f(x) = x^4$, then

Question

Let $f: \mathbb{R} \to \mathbb{R}$ be defined by $f(x) = x^4$, then –

$f$ is one-to-one and onto

$f$ may be one-to-one and onto

$f$ is one-to-one but not onto

$f$ is neither one-to-one nor onto

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