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A bag contains $4$ orange balls and $5$ purple balls. Raina draws three balls out of the bag, one at a time, without replacement. What is the probability that the colors of the balls alternate?

 

 

So I'm not sure where to start with this problem? Could somebody explain? I would appreciate it :)

 Apr 4, 2022
 #1
avatar+36417 
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To alternate, Raina would have    orange   blue   orange   

                                or                 blue   orange   blue

 

for orange   blue    orange:       4/9  *  5/8  *  3/7     <====== add this to the next scenario 

for  blue   orange    blue :          _____________         can you finish?

 Apr 4, 2022
 #2
avatar+36417 
0

Sorry.....   change   'blue'   to  'purple'   !  cheeky

ElectricPavlov  Apr 4, 2022

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