GRE
$$\frac{n!}{(\frac{n}{2})!}$$
2($$\frac{n}{2}$$)!
$$r-p$$
$$t-s$$
|x|
$$x^{2}$$
The probability that A or B or both will occur tomorrow
0.92
The median value for the combined sample of the 16 numbers
51
25000 +道题目
269本备考书籍