I roll 6 6-sided regular dice. What is the expected number of unique up-facing sides I will find among those dice?
2026-04-01 17:46:54.1775065614
Expected number of different faces in multiple die roles
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The easiest way is to calculate the probability you will see one particular number, then use the linearity of expectation to multiply by $6$. What is the chance you see a $1$ with six dice?