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Mathematics · 2015
JEE Main 2015 · 2015-04-04 Offline · Q86
If 12 identical balls are to be placed in 3 identical boxes, then the probability that one of the boxes contains exactly 3 balls is:
If $\displaystyle 12$ identical balls are to be placed in $\displaystyle 3$ identical boxes, then the probability that one of the boxes contains exactly $\displaystyle 3$ balls is :
Official answer
(1)
$\displaystyle \frac{55}{3}\left(\frac{2}{3}\right)^{11}$
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JEE Main 2015 Mathematics question, with the answer from NTA’s final answer key. Where our answers come from.