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A box contains 4 white balls and 5 red balls. I draw 3 of them out of the box, one at a time, and set them aside. What is the probability that the balls I draw alternate between the two colors?

rohitaop  Jun 12, 2018
 #1
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You can case work.

 

Case 1: WRW=4/9*5/8*3/7=15/126

 

Case 2: RWR=5/9*4/8*4/7=10/63

 

Total is 25/126.

Guest Jun 13, 2018
 #2
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Your final total should be: 35/126 =5/18

Guest Jun 13, 2018

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