Question: An elevator starts with 10 people on the first floor of an eight-story building and stops at each floor. (a) In how many ways can

An elevator starts with 10 people on the first floor of an eight-story building and stops at each floor.

(a) In how many ways can all the people get off the elevator?

(b) How many ways are there for everyone to get off if no one gets off on some two specific floors?

(c) In how many ways are there for everyone to get off if at least one person gets off at each floor?

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