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
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.