Question
A movie company wants to make movies featuring various monsters. They want each movie to have at least 2 different monsters and no two movies to have the exact same set of monsters. What is the minimum number of monsters the company must use in order to make a million movies?
Answers
If they have n>=2k monsters to choose from, then we need
C(n,2) + C(n,3) + C(n,4) + ... + C(n,k) >= 500,000
10
∑ C(20,k) = 616,665
k=1
C(n,2) + C(n,3) + C(n,4) + ... + C(n,k) >= 500,000
10
∑ C(20,k) = 616,665
k=1
20
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