pushpitkc wrote:
What is the probability that a student randomly selected from a class of 42 is a boy with black eyes?
1. Half the students in the class are boys
2. One-third of the students in the class have black eyes.
Source:
Experts GlobalTo answer the question we need to know the number of students who are both boys and have black eyes.
We'll look for statements that give us this information, a Logical approach.
(1) No information on black eyes.
Insufficient.
(2) No information on boys.
Insufficient.
Combined:
No information on the overlap between 'boys' and 'black eyes' (there could be maximal overlap = 1/3 * 42 or there could be no overlap at all)
Insufficient.
(E) is our answer.
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71% (00:51) correct 
