抽屉原理及最差原则
建立抽屉,4种花色看做4个抽屉,考虑最差情况：
（1）前8张,每种花色各两张
那么再抽出任意一张,前面8张中肯定与这张花色相同
即至少要抽出8+1=9张
（2）黑桃占13张,红桃占13张,其余的占26张,所以至少要取26+3=29张
a)How many cards must be selected from a standard deck of 52
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