Mathematics · 2019
JEE Main · 11 January 2019, Shift 2 · Q87
Let S={1,2, …., 20}. A subset B of S is said to be "nice", if the sum of the elements of B is 203. Then the probability that a randomly chosen subset…
Let $\displaystyle S=\{1,2, \ldots ., 20\}$. A subset $\displaystyle B$ of $\displaystyle S$ is said to be "nice", if the sum of the elements of B is $\displaystyle 203$ . Then the probability that a randomly chosen subset of S is "nice" is :
Official answer
(1)
$\displaystyle \frac{5}{2^{20}}$
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JEE Main 2019 Mathematics question, with the answer from NTA’s final answer key. Where our answers come from.