来自昂志毅的问题
Acertainclubhas10members,includingHarry.Oneofthe10membersistobechosenatrandomtobethepresident,oneoftheremianing9membersistobechoseatrandomtobethesecretary,andoneoftheremaining8membersistobechosenatrandom
Acertainclubhas10members,includingHarry.Oneofthe10membersistobechosenatrandomtobethepresident,oneoftheremianing9membersistobechoseatrandomtobethesecretary,andoneoftheremaining8membersistobechosenatrandomtobethetreasurer.WhatistheprobabilitythatHarrywillbeeitherthememberchosentobethesecretaryofthememberchosentobethetreasurer?
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2020-12-1713:33