GRE
$$\frac{(-1)^{11n+7}}{(-1)^{5n-2}}$$
-1
The sum of these n integers
The sum of the least and the greatest number
The number of positive integers between 0 and 10, inclusive
The number of odd integers between 10 and 30, inclusive
X-Y
25
The range of the integers in K and L combined
The range of the integers in L and M combined
x
3
$$\frac{n+2}{n+1}$$ - $$\frac{n+1}{n}$$
0
The sum of all the numbers in list L
101
$$\frac{1}{1+\frac{1}{x}}$$
$$\frac{x}{x+1}$$
$$\frac{1}{n}$$
2
25000 +道题目
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