Q: How many 6-digit numbers are there if no digit is repeated?

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720 (10*9*8)

823543

625 if numbers can have leading 0s, 500 otherwise.

81

9x9x8x7x6x5 = 81x56x30 = 136080

Related questions

757

720 (10*9*8)

823543

625 if numbers can have leading 0s, 500 otherwise.

9x9x8x7x6x5x4x3 =1632960

There are 5! = 120 such numbers.

81

9x9x8x7x6x5 = 81x56x30 = 136080

There are 4 possible numbers if the digits are not repeated; 18 if they are. Those are 3-digit numbers, assuming that zero would not be a leading digit. If zero is allowed for a leading digit, then you can have 6 for the non repeated, and 27 if repetition.

162

27 three digit numbers from the digits 3, 5, 7 including repetitions.

1