老鼠寻奶酪所用的平均时间 |
送交者: ultrasound 2005年07月12日09:05:41 于 [灵机一动] 发送悄悄话 |
A mouse has 3 rooms to go into. If it goes into room 1 it will find the cheese after 3 minutes. If it goes into room 2 it will look for cheese for 4 minutes,
If it goes into room 3 it will look for cheese for 5 minutes,
The mouse will not remember that it was in rooms 2 and 3 after it
What is the average time for the mouse to find cheese?
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