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by [email protected] » Wed Jun 30, 2010 9:13 pm
In a group of 400 readers who read science fiction or literacy works or both, 250 read science fiction and 230 read literacy works. How many read both science fiction and literacy works?
A) 80 B) 160 C) 220 D) 400
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by gmatmachoman » Wed Jun 30, 2010 9:20 pm
[email protected] wrote:In a group of 400 readers who read science fiction or literacy works or both, 250 read science fiction and 230 read literacy works. How many read both science fiction and literacy works?
A) 80 B) 160 C) 220 D) 400
Use Venn diagrams.

P(AUB) = P(A) +P(B) - p(AnB)

400 =250+230-p(AnB)

p(AnB) =80

Pick A
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