Mathematics · 2014
JEE Main · 11 April 2014, Shift 1 · Q86
A set S contains 7 elements. A non-empty subset A of S and an element x of S are chosen at random. Then the probability that x ∈ A is:
A set S contains $\displaystyle 7$ elements. A non-empty subset A of S and an element $\displaystyle x$ of S are chosen at random. Then the probability that $\displaystyle x \in \mathrm{~A}$ is :
Official answer
(2)
$\displaystyle \frac{64}{127}$
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JEE Main 2014 Mathematics question, with the answer from NTA’s final answer key. Where our answers come from.