1. A combination lock requires three selections of numbers, each from 0 througch 39. For each of the following questions, write an expression for your anwer, then give the numeric answer. (For example, 31 6) A How many total combinations are possible? b. How many combinations start with a number between 22 and 37 (inclusive)? e Suppose the lock is constructed in such a way that no number can be used twice in a row. How many combinations are possible?

Q: (6.47) (T4)-(r-3.6)

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A: The given relation is symmetric. The explanation is provided below.

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