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一副扑克牌除了两个王共有52张牌,在这52张牌中有四种花色——红桃,方片,梅花和黑桃。这四种花色各有13张。从中任意抽牌,问最少要抽多少牌,才能保证有四张牌是同一花色的?
A deck of cards has a total of 52 cards in addition to the two kings. There are four colors in the 52 cards - hearts, squares, plum and spades. Each of these four colors has 13 pieces. Any draw from which to ask at least how many cards to draw in order to ensure that four cards are the same suit?