Yosemite, and 18 had camped at both. How many had camped at neither. Sketch a venn diagram and display it for this problem.
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It is given that
n(U) = n(Universal) = 45
n( Yellowstone ) = n(A) = 27
n( Yosemite ) = n(B) = 23
n( Yellowstone and Yosemite ) = n(A and B) = 18
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