CBSE 2025 · Region 5 · Set 1 · Q7 · 1 mark
A bag contains red balls and black balls in the ratio $\displaystyle 3$ : 7. A ball is drawn at random. The probability that ball so drawn is black in colour, is
Official answer
From CBSE’s own marking scheme for this paper.
(C)
$\displaystyle 0.7$
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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.