Solution:-
1) The probability that the CDs are in alphabetical order is 1/15P8 = 1/ 259459200
2)
total number of possibilites = 24C3
a)
probability that all marbles are red = 9C3 / 24C3 = 84/2024 = 0.0415
b)
required probability = 9C2*15C1 / 24C3 = (36*15)/2024 = 0.2668
c)
required probability = 15C3 / 24C3 = 455/2024 = 0.2248
You own 15 CDs. You want to randomly arrange 8 of them in a CD rack....
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