Posted by **Anon** on Thursday, July 25, 2013 at 4:19pm.

each "word" in a special code is a three digit number. if no word in the code can begin with a 1 or 0, what is the greatest number of different words the code can contain?

28

512

800

900

1000

- Math -
**Graham**, Thursday, July 25, 2013 at 10:55pm
There are eight digits that can be in the first place, ten in each of the remaining two. Repetitions are allowed.

The universal theory of counting says: multiply 8, 10, and 10 together to get the answer.

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