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using the digits from 0 to 9 only once, what is the least 9-digit number that you can write?

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Mlcparra16viz
If we let the 9 digit number be abcdefghi then:
a<b<c<d<e<f<g<h<i since a has the greatest place value it should be the least.

Note that a cannot be 0 so a is 1 and b is 0 so the number is:
102,345,678