CBSE 2025 · Region 1 · Set 1 · Q19 · 1 mark
Assertion (A) : The probability of selecting a number at random from the numbers $\displaystyle 1$ to $\displaystyle 20$ is 1.
Reason (R): For any event E , if $\displaystyle \mathrm{P}(\mathrm{E})=1$, then E is called a sure event.
Official answer
From CBSE’s own marking scheme for this paper.
(A)
Both Assertion (A) and Reason (R) are true and Reason (R) is the correct explanation of the Assertion (A).
ProbabilityTheoretical ProbabilityUnderstandassertion_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.