Concept
Why is Pr( J ∩ S ) equal to zero?
Stephen Davies, Ph.D. Version 2.2.2 Through Discrete Mathematics A Cool Brisk Walk / Chapter 1
"Pr( J ∩ S )? Zero. Sets J and S have no elements in common, therefore their intersection is a set with no outcomes, and the probability of a non-existent outcome happening is 0. (Put another way, nobody is both a junior and a senior.)"
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