GRE

$$\frac{n!}{(\frac{n}{2})!}$$

2*($$\frac{n}{2}$$)!

The number of ordered pairs (x, y) in S such that x=y

16

$$(x-y)^{2}$$

3

a+b

10

y

8

The percent of the employees at Company X yesterday who did not leave for the day before 6 P.M

20%

The list price of the belt

The list price of the scarf

25000 +道题目

136本备考书籍