Questions and Answers of Introduction To Mathematical Statistics

As an incoming freshman, Marcus believes that he has a 25% chance of earning a GPA in the 3.5 to 4.0 range, a 35% chance of graduating with a 3.0 to 3.5 GPA, and a 40% chance of finishing with a GPA
What is the coefficient of w2x3yz3 in the expansion of (w + x + y + z)9?
Show that (k!)! is divisible by k! (k−1)!.

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