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by Zizou4 » Mon Feb 09, 2009 2:04 am
Can anyone help me with this one, tried venn diagram can't understand reasoning.
Thanx in advance!
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by Uri » Mon Feb 09, 2009 2:36 am
the question should say that 3/5 th of the students answered only Q1 correctly and 4/5th of the reminder answered only Q2 correctly. And nobody answered both Q wrong.
In that case, we know, 30 answered Q1 correctly and 16 answered Q2 correctly. Thus, 50-(30+16) = 4 students answered both Q correctly.
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