Question 1121829
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Since n(U) = 28 and n(B') = 19, n(B) must be 28 - 19 = 9.


Since n(A) + n(B) = 20 and n(A&#8746;B) = 18, then n(A&#8745;B) = 20 - 18 = 2]
								
								
John
*[tex \LARGE e^{i\pi}\ +\ 1\ =\ 0]
My calculator said it, I believe it, that settles it
<img src="http://c0rk.blogs.com/gr0undzer0/darwin-fish.jpg">
*[tex \Large \ \
*[tex \LARGE \ \ \ \ \ \ \ \ \ \  
								
{{n}\choose{r}}
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