CBSE 2025 · Region 1 · Set 1 · Q19 · 1 mark
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
From CBSE’s own marking scheme for this paper.
(D)
Assertion (A) is false, but Reason (R) is true.
Relations and FunctionsTypes of FunctionsAnalyseassertion_reasonmedium
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CBSE Class 12 Mathematics past-paper question from the 2025board exam, with the answer as CBSE’s own marking scheme gives it. Where our answers come from.