Posted by Andrew on Wednesday, November 14, 2012 at 9:54pm.
In each case we can assume that no whole number starts with a zero, and no repeating digits for all 3 cases.
number of 4 digits numbers = 6x6x5x4 = 720
number of 3 digit odd numbers, (must end in an odd) = 5x5x3 = 75
number of 3 digit numbers = 6x6x5 = 180
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