Question 1154899
<pre><font face = "consolas" color = "indigo" size = 4><b>
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 - {{{(17/20) (16/19)(15/18)}}}
 
(2) 1 of each color is drawn: P = 1 -NO red - NO blue - NO white
P =1- {{{(12/20) (11/19)(10/18)-  (11/20) (10/19)(9/18)- (17/20) (16/19)(15/18) }}}
  
(3) the balls are drawn in the order red ,white blue .  
P = {{{(8/20) (3/19)(9/18)}}}