Question 616181
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Hi,
 An urn contains {{{25}}} marbles: 5 red, 8 blue, 7 white , and 5 yellow.
4 marbles are selected at random.
P(each different color) = {{{(5C1*8C1*7C1*5C1)/(25C4)}}}
P(same color) = P(all red)+P(all blue) + P(all white) +P(all yellow)
              = {{{(5/25)*(4/24)*(3/23)*(2/22) + (8/25)*(7/24)*(6/23)*(5/22) + (7/24)*(6/24)*(5/23)*(4/22) + (5/25)*(4/24)*(3/23)*(2/22)}}}