## Online Course Discussion Forum

### Math Challenge II-A Combinatorics Chapter 5 Practice Question 5.21 Part b)

Referring to Math Challenge II-A Combinatorics Chapter 5 Practice Question 5.21 Part b)

Why is the answer shown on the website 29 choose 15? Shouldn't it be 29 choose 15 and then minus 15, since there are 15 ways in which all 15 passengers will get off the train at the same stop?

Thanks!

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