Question 1174299
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Hi
  10 marbles:  7B and 3R

if 3 marbles is drawn at random <U>without replacement</U>: 
find the probability of choosing 
(a) one red, one black and one red in that order: (3/10)(7/9)(2/8)
(b) at least two black marbles   
1 - No black marbles = 1-binomcdf(3, .7, 0) = 1 - .027   = .973
(c) at most two black marbles   binomcdf(3, .7, 2) = .657

Wish You the Best in your Studies.
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