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Q: How many school id numbers be made up of digits that can be repeated but first digit an not be 0?

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Using the digits of 1345678, there are 210 three digit numbers in which no digit is repeated.

987,653

500

It is 120 if the digits cannot be repeated.

There are only two smaller 3-digit numbers and both of them have repeated digits.

Related questions

It is possible to create a 3-digit number, without repeated digits so the probability is 1.

757

Using the digits of 1345678, there are 210 three digit numbers in which no digit is repeated.

9x9x8x7x6x5x4x3 =1632960

987,653

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

24

500

There are 5*4*3 = 60 such numbers.

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.

1 set

It is 120 if the digits cannot be repeated.