填空题

Each integer from 1 to 50 whose units digit is a 3 is written on a slip of paper and placed in a box. If two slips of paper are drawn at random, what is the probability that both the numbers picked are prime（）

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单项选择题

A school group charters three identical buses and occupies of the seats. After of the passengers leave, the remaining passengers use only two of the buses.（）

A. if Quantity A is greater;
B. if Quantity B is greater;
C. if the two quantities are equal;
D. if you cannot determine the relationship based on the given information.

单项选择题

George earned 80, 85 and 90 on the first three tests in his geography class. Because he didn’t have time to study, he decides to guess randomly on the final test. That test has ten true-false questions, each worth 10 points. What is the probability his final average is more than 85（）

A.A
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