中国建设银行
现有16张不同的卡片,其中红色、黄色、蓝色、绿色卡片各4张。从中任取3张,要求这3张卡片不能是同一种颜色,且红色卡片至多1张。不同取法的种数为( )。
A.232
B.252
C.472
D.484
若所取三张卡片中没有红色,在其余l2张里取3张.排除3张卡片同色的情况,
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平地上有100棵树,高度从最低3米到最高l0米不等,且任意两棵树之间的距离都不超过它们高度差的50倍。现在要用篱笆将它们全部围起来,在不知道树木位置的情况下,至少要准备多少米的篱笆才能确保完成任务?
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从l,2,3…n中,任取57个数,使这57个数必有两个数的差为l3,则n的最大值为
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一项工程由甲、乙两队合作30天可以完成。若甲单独做24天后乙队加入,两队合作l0天后,甲队被调走,乙队继续做了l7天才能完成,则这项工程由甲、乙两队单独完成各需多少天?
A.52、70.5
B.52.5、70
C.70、52.5
D.70.5、52
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