How many possibilities are there for a six digit password composed of 0,1,2,3,4,5,6,7,8,9 Line it up

1) The number on each digit can be selected from 10 digits, so it can form six digit number = 10 ^ 6 = 1000000; 2) because the highest order of six digits (100000 digits) can not be 0, it can form six digit number = 9 × 10 ^ 5 = 900000; 3) because there is no repetition of digits, the numbers used before can not be used again

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