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The guy asked for a challenge for extra video game time, so I thought of a slightly complex probability problem: Given a deck of ten cards A-10, what are the chances of drawing the exact sequence A-2-3. What are the chances of drawing A, 2, 3 in any order in three draws?
I thought it would take about 30 minutes with me answering lots of questions. It took five minutes, no questions. What does my kid know? It turns out I have no idea.