Assuming no zeroes, 9 x 8 x 7 x 6 x 5 x 4 x 3 x 2 ie 362880.
If zeroes are included but not in first position, then 9 times above figure, ie 3265920.
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The second digit can be 2,4,6, or 8. There are 4 ways of choosing the second digit. The first digit can be chosen from the remaining 8 digits. 8x4 = 32 numbers. Here, it is assumed that the numbers do not repeat
Six, if you don't repeat any.
6 if you don't repeat any.
6 if you don't repeat any.