GRE
$$r$$
$$7$$
The median of $$a, b, c, d$$, and $$e$$
$$\frac{a+b+c+d+e}{5}$$
$$\frac{n+n^2}{n^3+n^4}$$
$$\frac{1}{n^2}$$
The length of arc $$MPN$$
The length of arc $$MQN$$
\frac{1}{1+3^x}
\frac{1}{1+5^x}
$$n$$
$$10$$
$$(n+2)!-n!$$
$$(n+1)!$$
$$a_{15}$$
$$a_{27}$$
The fraction of values of $$X$$ between 5 and 11
The fraction of values of $$X$$ between 1 and 4
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269本备考书籍