Mathematics · 2015
JEE Main · 10 April 2015, Shift 1 · Q86
Let X be a set containing 10 elements and P(X) be its power set. If A and B are picked up at random from P ( X ), with replacement, then the…
Let X be a set containing $\displaystyle 10$ elements and P(X) be its power set. If A and B are picked up at random from $\displaystyle \mathrm{P}(\mathrm{X})$, with replacement, then the probability that A and B have equal number of elements, is :
Official answer
(4)
$\displaystyle \frac{{ }^{20} C_{10}}{2^{20}}$
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JEE Main 2015 Mathematics question, with the answer from NTA’s final answer key. Where our answers come from.