CBSE 2025 · Region 6 · Set 1 · Q20 · 1 mark
In an experiment of throwing a die,
Assertion (A) : Event $\displaystyle \mathrm{E}_{1}$ : getting a number less than $\displaystyle 3$ and Event $\displaystyle \mathrm{E}_{2}$ : getting a number greater than $\displaystyle 3$ are complementary events.
Reason (R) : If two events E and F are complementary events, then $\displaystyle \mathrm{P}(\mathrm{E})+\mathrm{P}(\mathrm{F})=1$.
Official answer
From CBSE’s own marking scheme for this paper.
(D)
Assertion (A) is false, but Reason (R) is true.
ProbabilityComplementary EventsUnderstandassertion_reasoneasy
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CBSE Class 10 Mathematics past-paper question from the 2025board exam, with the answer as CBSE’s own marking scheme gives it. Where our answers come from.