题目073 · 概率
Divisibility Events and the Containment Trap
Let $\Omega = \{0, 1, 2, \ldots, 11\}$ with uniform probability $P(\{k\}) = 1/12$ for each $k$. Define three events based on divisibility: $A = \{k \in \Omega : 2 \mid k\}$ (even numbers), $B = \{k \in \Omega : 3 \mid k\}$ (multiples of $3$), $C = \{k \in \Omega : 4 \mid k\}$ (mu
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