GMAT
GMAT
Each of the integers from 0 to 9,inclusive,is written on a separate slip of blank paper and the ten slips are dropped into a hat.If the slips are then drawn one at a time without replacement,how many must be drawn to ensure that the numbers on teo of the slips drawn will have a sum of 10?
a) 3
b)4
c) 5
d)6
e)7 求中文翻譯
Each of the integers from 0 to 9,inclusive,is written on a separate slip of blank paper and the ten slips are dropped into a hat.If the slips are then drawn one at a time without replacement,how many must be drawn to ensure that the numbers on teo of the slips drawn will have a sum of 10?
a) 3
b)4
c) 5
d)6
e)7 求中文翻譯
英語人氣：870 ℃時間：2020-05-12 07:23:20
優(yōu)質(zhì)解答
題干問的是要抽幾次才能保證其中任意抽出的2個數(shù)字之和是10.假設最壞的情況,抽出的是 0,1,2,3,4,5,這幾個數(shù)任意2個加起來都不等于10.那么這樣一共抽了6次.從第7次開始,抽出的數(shù)和前面的相加都等于10.所以選E
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