Hi  

20 balls, 8 red ,3 white ,9 blue

3 balls are drawn random without replacement

(1) at least 1 is white: That is:  P = 1 - NO white

Each parenthesis represents a draw - each draw results in less of the specific type and less marbles

P(at least 1 white) =1 - NO white=  1 - 

 

(2) 1 of each color is drawn: P = 1 -NO red - NO blue - NO white

P =1- 

  

(3) the balls are drawn in the order red ,white blue .  

P = 

 

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