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单选题

Each of seven identical cards is numbered on one of its sides with a different integer from 1 to 7. The cards are turned over and then shuffled so that they are not in a predictable order. If two cards are selected at random without replacement, what is the probability that their sum is at least l1?

发布日期:2021-11-23

Each of seven identical cards is numbered on one o...
A

4/9

B

4/21

C

49/81

D

7/10

E

4/7

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此试题出现在

国外英语考试

美国学术能力评估考试(SAT)

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