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JEE Main 2014 Mathematics question

MathematicsProbabilityJEE Main 2014

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 is:

Answer: (2)

Solution

There are non-empty subsets. Each of the 7 elements lies in of all subsets, all of which are

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Question ID VK-104523