math probability

if you can take 4 exams scheduled out of 10 possible times, how many ways can you be scheduled?

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  1. Your first exam can be in 10 different time slots,
    your second in 9 time slots, etc

    so number of possible schedules = 10x9x8x7 = 5040

    I assumed that the order you are taken the exams does matter.

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