Real estate agents usually keep the key to the house they are showing in a lockb
ID: 3204891 • Letter: R
Question
Real estate agents usually keep the key to the house they are showing in a lockbox at the house. Here's one example of such a lockbox. This lockbox uses letters instead of numbers, and an individual code is three letters long. However, a wheel with all 26 letters would be too big. so, each wheel only has the twelve letters. The choice of letters on each wheel does not affect the answer to this question, but in case you're curious, this particular lock (available for purchase online) has: Top wheel: ACFHILMNOPSW Middle wheel: ACDFHILMNOPR Bottom wheel: BDEHLNOQRSTW How many unique 3-letter sequences are there for this lock?Explanation / Answer
Each wheel has 12 distinct letters and there are 3 wheels.
Number of ways of possible combination = 12C1 * 12C1 * 12C1 = 123 = 1728
(We choose 1 letter out of 12 letters of a wheel and do it for all 3 wheels)
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