SOLUTION: in a class of 30 students, 3/5 of the class are girls, and 2/5 of the class have black hair, and 1/5 of the girls are girls with black hair. if one student is to be chosen at rando

Algebra ->  Probability-and-statistics -> SOLUTION: in a class of 30 students, 3/5 of the class are girls, and 2/5 of the class have black hair, and 1/5 of the girls are girls with black hair. if one student is to be chosen at rando      Log On


   

Question 1036879: in a class of 30 students, 3/5 of the class are girls, and 2/5 of the class have black hair, and 1/5 of the girls are girls with black hair. if one student is to be chosen at random from the class, what is the probability that the student is a girl with black hair?
Answer by ikleyn(52787) About Me  (Show Source):
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in a class of 30 students, 3/5 of the class are girls, and 2/5 of the class have black hair, and 1/5 of the girls are girls with black hair.
if one student is to be chosen at random from the class, what is the probability that the student is a girl with black hair?
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The condition is self-contradicting.

There are 30%2A%283%2F5%29 = 18 girls in the class

and 1%2F5 of the girls (of the 18 !) have black hair ??????????????