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Mathematics · 2018
JEE Main 2018 · 2018-04-08 Offline · Q86
A bag contains 4 red and 6 black balls. A ball is drawn at random from the bag, its colour is observed and this ball along with two additional balls…
A bag contains $\displaystyle 4$ red and $\displaystyle 6$ black balls. A ball is drawn at random from the bag, its colour is observed and this ball along with two additional balls of the same colour are returned to the bag. If now a ball is drawn at random from the bag, then the probability that this drawn ball is red, is :
Official answer
(2)
$\displaystyle \frac{2}{5}$
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JEE Main 2018 Mathematics question, with the answer from NTA’s final answer key. Where our answers come from.