[질문] 갑을병세명이 어떤시험에합격할확률이각각1/2,3/5,2/3 일때 세명중두명이상합격할확률

1/2*3/5*1/3+1/2*2/4*2/3+1/2*3/5*2/3 + 1/2*2/5*2/3 =1/10+1/10+2/10+ 2/15 = 16/30 = 8/15 입니다.