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.
回複:這解有點殺鴨用牛刀的味道。
所有跟帖:
• 回複:回複:這解有點殺鴨用牛刀的味道。 -jinjing- ♀ (32 bytes) () 04/23/2010 postreply 17:51:46