GRE
The number of combinations of $$100$$ objects taken $$j$$ at a time
The number of combinations of $$100$$ objects taken $$k$$ at a time
The units digit of N
6
$$x$$
$$y$$
The standard deviation of the five numbers 10, 30, 50, 70, and 90
The standard deviation of the five numbers 10, 45, 50, 55, and 90
p
$$\frac{1}{2}$$
25000 +道题目
236本备考书籍