Question 1036879
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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*(3/5)}}} = 18 girls in the class


and {{{1/5}}} of the girls (of the 18 !) have black hair ??????????????