Set up an X-block school library?

Because there are 12 people, every two people sit on a stool together, so after 2 1 people come in, there are 6 people who are redundant.

So we can get x/8=2 1-6.

X= 120。

According to the condition1* (1-1/2) * (1-1/3) * ... * (1-kloc-0//2009) *

X * 1/2 * 2/3 * 3/4 *...* 2008/2009 = 10?

Available x/2009= 100? Then x=200900.

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