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Complexity of / best algorithm for finding the dichotomy that maximizes information gain?

Suppose that $X$ is a finite set with a probability measure $P$. I want to find the subset $A \subset X$ so that the information gain of conditioning on ${A, A^c}$ is maximal. That is, I want to find $...
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A max-even subset problem

I want to know if there is any polynomial algorithm for the problem, or any NP-completeness result. Given a set $S$ and $m$ subsets $C_1, \dots, C_m$ of $S$, we want to find a non-empty set $X\...