Posted by **Sue Jackson** on Monday, August 20, 2012 at 10:40pm.

In a recent survey of 100 women, the following information was gathered.

29 use shampoo A.

28 use shampoo B.

34 use shampoo C.

3 use shampoos A and B.

7 use shampoos A and C.

6 use shampoos B and C.

1 use all three.

How many use shampoo A only?

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