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S1 Jan 2005
I am slightly confused over this question
Articles made on a lathe are subject to three kinds of defect, A, B or C. A sample of 1000 articles were inspected and the following results obtained
31 had a type A defect
37 had a type B defect
42 had a type C defect
11 had both type A and type B defects
13 had both type B and type C defects
10 had both type A and C defects
6 had all three types of defects
Could those with two defects actually have three?
Articles made on a lathe are subject to three kinds of defect, A, B or C. A sample of 1000 articles were inspected and the following results obtained
31 had a type A defect
37 had a type B defect
42 had a type C defect
11 had both type A and type B defects
13 had both type B and type C defects
10 had both type A and C defects
6 had all three types of defects
Could those with two defects actually have three?
Reply 1
Draw A Venn Diagram 
Reply 2
that was the question? drawn the venn but I dont get what it wants.
Reply 4
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