箱子包含從編號到0000至9999個抽奖券。 票從箱子隨機得出。 說出Probability符合以下要求。
a) 最后數字由3是可分的
b) 最後二個數字是相同的。
c) 最後三個數字是123, 456, 789。
[數學]Probability 中三數學中難題 (唔識計)
由 ts02895853 於 星期四 二月 19, 2009 5:40 pm
A box contains 10000 lottery tickets which are numbered from 0000 to 9999. A ticket is drawn at random from the box. Find the probability that the number on the ticket drawn meets the following requirement.
a) The last digit is divisible by 3
b) The last two digits are the same.
c) The last three digits are 123, 456, 789.