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Q: Which is the smallest 9 digit odd number?

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117

As the number is odd it must end in an odd digit; the odd digits are 1, 3, 5, 7, 9 and the smallest is 1 which is the sum of 1 and 0. Thus the smallest 7-digit number which meets your criteria is 1,001,001

101

What is the least possible 6 digit odd number with only using 1 to 9 once

It is the digit 9

9

987654321

-9

9

The smallest number that is both odd and composite is 9, which is divisible by 3. The odd numbers are 1, 3, 5, 7, 9, 11, ..., and 1, 3, 5, and 7 are all prime. It is 9 that is the smallest odd composite number.

9

10 is the smallest 2-digit whole number.

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