扑克中的概率和文氏图
扑克中的概率P(Jack) = 4/52 = 1/13
P(♥) = 13/52 = 1/4
P(J and ♥) = 1/52
p(J or ♥) = (4+13-1)/52 = 16/52 = 4/13
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只要路是对的,就不怕路远