You have 9 options for the first position (all except zero); 9 options for the second position (any digit except the digit used for the first position; 8 options for the third position; 7 options for the fourth position; 6 options for the fifth position; and 5 options for the sixth position. Multiply everything together.
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256
24
Without repeating digits (not digets!) and without leading 0s, 600 of them.
60
It is a repeating decimal.