问答题

A number x is chosen at random from the set of positive integers less than 10. What is the probability that

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单项选择题

As two wheels--A and B--roll across the ground, they both rotate at a rate of 60 revolutions per second. The radius of wheel A is 3. The radius of wheel B is 1.5.（）

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

Two competitors battle each other in each match of a tournament with nine participants. What is the minimum number of matches that must occur for every competitor to battle every other competitor（）

A. 27
B. 36
C. 45
D. 64
E. 81