回复:这解有点杀鸭用牛刀的味道。

回答: Boy Meets Girlcommentate2010-04-13 18:10:10

A: the area is defined by x=0, y=0, x=60, y=60, y=x-20 and y=x+20.
B: the area is defined by x=0, y=0, x=60, y=60.
The probability = A/B = 5/9.

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回复:回复:这解有点杀鸭用牛刀的味道。 -jinjing- 给 jinjing 发送悄悄话 (32 bytes) () 04/23/2010 postreply 17:51:46

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