Question 407929
How many positive integers less than 25 can be formed by using the digits 1,2,and 3?
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You'll have to find out whether you can use them more than once.

If you can, then there are these 9

1, 2, 3, 11, 12, 13, 21, 22, 23

If you can't, then there are only these 7

1, 2, 3, 12, 13, 21, 23

Edwin</pre>