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Quandaries & Queries
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 Topic: combination locks
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 Why the word combinations? 2004-05-05 From Megan:Why are locker combinations called locker combinations not locker permutations. The order of the numbers matter so why aren't they called locker permutations.Answered by Claude Tardif and Penny Nom. Combination locks 2002-08-17 From John:How many combinations of three number codes can occur with a standard combination lock? The range of possible numbers is 0-39 which allows 40 different possible choices each turn of the dial. Each combination requires exactly three numbers (i.e. three turns of the dial). E.g. 35-40-5. Allow for reuse of the same number three times e.g.10-10-10. I don't think there is any preference shown for certain number combinations. Can you explain how the total is derived? Someone at the YMCA this week put this question to me and I gave an answer but I am not sure I am right--so I have come to you.Answered by Penny Nom.

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