zogfly3的部落格

標題:

Math 一問

發問:

http://farm4.static.flickr.com/3107/3101755951_2034c7e088.jpg?v=0 唔該

最佳解答:

Let E, S, W and N be the short name of East House, South House, West House and North House respectively, (a) P(EE, SS, WW & NN) = 1/4 x 1/4 + 1/4 x 1/4 + 1/4 x 1/4 + 1/4 x 1/4 = 1/16 + 1/16 + 1/16 + 1/16 = 4/16 = 1/4 (The answer) (b) P(Choose North House & North House Wins) = 1/4 x [ 3 / ( 3 + 2 + 2 + 1 ) ] = 1/4 x 3/8 = 3/32 (The answer)

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