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Posted 05 July 2013 - 09:49 PM
An examination in three subjects, Algebra, Biology, and Chemistry was taken by 41 students. The following table shows how many students failed in each single subject and in their various combinations:
Subject: A B C AB AC BC ABC
Failed: 12 5 8 2 6 3 1
For instance, 5 students failed in Biology, among whom there were 3 failing both in Biology and in Chemistry, and just one of these 3 failed in all three subjects.
How many students passed in all three subjects?
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