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how many positive integers less than 25 can be formed by using the digits 1,2 and 3

Sagot :

AL2006idn
I tried to think of a fancy formula for it, then decided it's just easier to list them:

1
2
3
11
12
13
21
22
23

That's 9 of them.
Markopoloidn
there are 9 numbers that are positive integers that can be formed by the #s 1,2,&3 THAT R LESS THAN 25 1 2 3 11 12 13 21 22 23
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