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Mathematics · 2025 · 1 mark
CBSE 2025 · Region 1 · Set 1 · Q19
Assertion (A): Let Z be the set of integers. A function f: Z → Z defined as f (x)=3 x-5, ∀ x ∈ Z is a bijective. Reason (R): A function is a…
Assertion (A) : Let Z be the set of integers. A function $\displaystyle \mathrm{f}: \mathrm{Z} \rightarrow \mathrm{Z}$ defined as $\displaystyle \mathrm{f}(x)=3 x-5, \forall x \in \mathrm{Z}$ is a bijective.
Reason (R) : A function is a bijective if it is both surjective and injective.
Official answer
(D)
Assertion (A) is false, but Reason (R) is true.
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CBSE Class 12 Mathematics past-paper question from the 2025 board exam, with the answer as CBSE’s own marking scheme gives it. Where our answers come from.