Mathematics · 2020
JEE Main · 2 September 2020, Shift 1 · Q68
Box I contains 30 cards numbered 1 to 30 and Box II contains 20 cards numbered 31 to 50. A box is selected at random and a card is drawn from it. The…
Box I contains $\displaystyle 30$ cards numbered $\displaystyle 1$ to $\displaystyle 30$ and Box II contains $\displaystyle 20$ cards numbered $\displaystyle 31$ to 50. A box is selected at random and a card is drawn from it. The number on the card is found to be a non-prime number. The probability that the card was drawn from Box I is :
Official answer
(1)
$\displaystyle \frac{8}{17}$
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JEE Main 2020 Mathematics question, with the answer from NTA’s final answer key. Where our answers come from.