namany6522 namany6522

12-03-2024
Mathematics

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Give a combinatorial proof of this identity. Hint: What if some number of a group of people wanted to go to an escape room, and among those going, one needed to be the team captain?

a) nCk=nC(n−k)
b) nCk=nPk
c) nPk=nCk
d) n!=nCk×nPk

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