Like 1, 3, 5, 7, 9 ? Those are all odd, there are 5 of them.. Hope this is what you were looking for...
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8549176320 contains each digit from 0 to 9, in alphabetical order
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
Look at the last digit: * if it is one of {0, 2, 4, 6, 8} it is an even number; * if it is one of {1, 3, 5, 7, 9} it is an odd number. The last digit of 661290 is 0, so it is an even number.
999 is the greatest 3 digit number and it is odd because it ends with a 9.
5 x 10 x 5 = 250 different numbers, assuming there is no limit to each digits' use.