GRE
The greatest possible value of x such that $$2^{x}$$ is a factor of n(n+2)(n+4)(n+6)
The greatest possible value of y such that $$2^{y}$$ is a factor of n(n+2)(n+4)(n+6) + 320
$$\frac{9^{17}}{8^{17}}$$
$$\frac{9^{17}+5^{10}}{8^{17}+5^{10}}$$
The ones digit of $$208^{208}$$
7
25000 +道题目
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