What is the approximate probability (in percentage) that at least $2$ people in a group of $6$ randomly-selected have a birthday on the same day of the week?
2026-04-11 18:34:15.1775932455
Birthday Problem
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$1-\frac{365*(365-7)*(365-14)*(362-21)*(361-28)*(360-35)}{365^6}$