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OpenStudy (anonymous):
A combination lock should probably be called a permutation lock, because the order of the numbers does matter. How many different 3-number permutations are there on a lock with 36 digits?
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OpenStudy (queelius):
It makes sense that a lock allows numbers to repeat; therefore, the more likely answer is 36 * 36 * 36 rather than 36 * 35 * 34.
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