单项选择题

Each person at a party shook hands exactly once with each of the other people at the party．There was a total of 21 handshakes exchanged at the party．（）

A. if the quantity in Column A is greater;
B. if the quantity in Column B is greater;
C. if the two quantities are equal;
D. if the relationship cannot be determined from the information given.

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单项选择题

The median of 10，15，x and y is 18.5，and x＜y．（）

A. if the quantity in Column A is greater;
B. if the quantity in Column B is greater;
C. if the two quantities are equal;
D. if the relationship cannot be determined from the information given.

单项选择题

The geometric mean of any two positive numbers x and（）

A. if the quantity in Column A is greater;
B. if the quantity in Column B is greater;
C. if the two quantities are equal;
D. if the relationship cannot be determined from the information given.