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Is a class contains 10 boys and 20 girls of which half of boys and half of girls have brown eyes then find the number of ways that a person chosen at random is a boy or has brown eyes?
Wiki User
∙ 14y ago
think that this will be solved like followings
total number of students=n=30
total number of boys=10
total number of girls=20
toatal number of students with brown eys=15
thus
total number of ways =10! + 30p15
=10! + (30!/(30-15)!
Wiki User
∙ 14y ago
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