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 文氏图 1234567891011121314151617181920 '''' # of Jacks / / +---------/--------------------------+ | / 52 | | /--/-- | | | 4 | | | | /----------- | | ---|./ | | | ,'` 13 | | | _-` | | | | .' ----------/ | ,-` | # of J -` | | and ♥ | | +-----------------------------------+ # of ♥ '''' 赞微海报分享
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