Mathematics · 2018
JEE Main · 15 April 2018, Shift 1 · Q87
A box 'A' contains 2 white, 3 red and 2 black balls. Another box 'B' contains 4 white, 2 red and 3 black balls. If two balls are drawn at random,…
A box 'A' contains $\displaystyle 2$ white, $\displaystyle 3$ red and $\displaystyle 2$ black balls. Another box 'B' contains $\displaystyle 4$ white, $\displaystyle 2$ red and $\displaystyle 3$ black balls. If two balls are drawn at random, without replacement, from a randomly selected box and one ball turns out to be white while the other ball turns out to be red, then the probability that both balls are drawn from box 'B' is :
Official answer
(2)
$\displaystyle \frac{7}{16}$
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JEE Main 2018 Mathematics question, with the answer from NTA’s final answer key. Where our answers come from.