SOLUTION: How many three-digit numbers use only the digits 0, 1 and 5?

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Question 1120933: How many three-digit numbers use only the digits 0, 1 and 5?
Answer by ikleyn(52856) About Me  (Show Source):
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Two digits in the most left position (1 or 5);


Three digits in the next ("tens") position;


and three digits in the next ("ones") position.


In all, there are  2*3*3 = 18 such three-digit numbers.