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A key for a lock with five tumblers |
2016-11-02 |
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From Aeriel:
A lock works by having a key turn a sequence of tumblers. Consecutive tumblers have different heights, and in order to unlock the lock, the sequence of heights on the key must exactly match those of the lock. The picture below shows a lock with four tumblers.
How many different keys can be made for a lock that has 7 tumblers with 5 possible heights each?
Answered by Penny Nom. |
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