推 bugle:明天可以請王老師在黑板上講解 10/19 22:08
推 hjynt:誰是王老師 10/20 00:43
推 bugle:有教師證的郁萍!! 10/20 23:03
A and B play until one has 2 more points than the other .
Assumeing that each point is independently won by A with probability 2/3
what is the probability they will play a total of 2n points?
絞盡腦汁也要給它想出來啊!!
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