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Mathematics · 2025 · 1 mark
CBSE 2025 · Region 6 · Set 1 · Q20
Assertion (A): Let f ( x )= e^x and g ( x )= log x. Then ( f + g ) x = e^x + log x where domain of ( f + g ) is R. Reason (R): Dom ( f + g )= Dom ( f…
Assertion (A) : Let $\displaystyle \mathrm{f}(\mathrm{x})=\mathrm{e}^{\mathrm{x}}$ and $\displaystyle \mathrm{g}(\mathrm{x})=\log \mathrm{x}$. Then $\displaystyle (\mathrm{f}+\mathrm{g}) \mathrm{x}=\mathrm{e}^{\mathrm{x}}+\log \mathrm{x}$ where domain of ( $\displaystyle \mathrm{f}+\mathrm{g}$ ) is R . Reason $\displaystyle (R): \quad \operatorname{Dom}(\mathrm{f}+\mathrm{g})=\operatorname{Dom}(\mathrm{f}) \cap \operatorname{Dom}(\mathrm{g})$.
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.