(a). The total number of balls = 5 + 3 + 7 = 15
(b). Two balls can be blue and green in two ways because the first ball drawn is not replaced, therefore the order of the balls matter.
Case 1: First ball is blue, second is green
Case 2: First ball is green, second is blue
Total probability is given by
(c). P( At least one if blue or at least one is green) = 1 - P(Both are white)
(d). Case 1: Both are blue
Case 2 : Both are green
4. An urn contains 5 blue balls, 3 green balls, and 7 white balls. (a) A...
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