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October 21, 2014

Homework Help: math

Posted by Anonymous on Monday, February 6, 2012 at 2:35pm.

In a recent survey of 100 women, the following information was gathered.
30 use shampoo A.
43 use shampoo B.
33 use shampoo C.
13 use shampoos A and B.
7 use shampoos A and C.
5 use shampoos B and C.
3 use all three.
How many are using shampoo A only (Region I)?

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