GRE
The percent of polygons that are neither hexagons nor regular polygons
16%
$$a_{98}$$
300
The number of bacteria in culture A at 2:00 that afternoon
The number of bacteria in culture B at 2:00 that afternoon
$$r_{5}$$
$$625*r_{10}$$
$$a_{7}$$
-12
n!-k!
(n-k)!
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236本备考书籍