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Mathematics · 2026 · 1 mark
CBSE 2026 · Region 4 · Set 1 · Q18
A box contains 4 red, 5 blue and 1 green marble. A child randomly takes out a marble from the box, notes down the colour and puts it back in the box.…
A box contains $\displaystyle 4$ red, $\displaystyle 5$ blue and $\displaystyle 1$ green marble. A child randomly takes out a marble from the box, notes down the colour and puts it back in the box. If the activity is repeated $\displaystyle 3$ times, what is the probability that at least one marble is red?
Official answer
(D)
$\displaystyle \frac{98}{125}$
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CBSE Class 12 Mathematics past-paper question from the 2026 board exam, with the answer as CBSE’s own marking scheme gives it. Where our answers come from.