STREAK 0dLV 1 0 XP
Institute site

Problem Bank · ev-2

Expected Value · Linearity & indicatorsAIME style●●●●○ 7/10~4 min⏱ 0:00
Ten people throw their hats in a pile and each picks one back uniformly at random. What is the expected number of people who get their own hat?
linearityindicatorsclassic