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Q: How many 4 digit numbers can be formed from the digits 12345?

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It is 120 if the digits cannot be repeated.

If repetition of digits isn't allowed, then no13-digit sequencescan be formed from only 5 digits.

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125

5040 different 4 digit numbers can be formed with the digits 123456789. This is assuming that no digits are repeated with each combination.

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

There are 625 of them - too many to list.

There are 3024 of them.

180 of them.

840

There are 60480 numbers.

24

500

12345

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

If the two must be different digits, then there 20 possibilities. If they can be the same one, then there are 25 possibilities.

There are 5! = 120 such numbers.

The number 1234567890 can create about 39 of 40 4 digit numbers.

14 is a factor of 532.

There are 34 = 81 numbers.

6!

There are 900 of them.

The first digit may be any of 5 possibilities. The second digit may not be same as first, so only 4 possibilities. Likewise 3rd, 4th, and 5th digits may be chosen from only 4 possibilities. All together: 5*4*4*4*4 = 1,280 numbers.

Since there are only five different digits, a 6-digit number can only be generated if a digit can be repeated. If digits can be repeated, the smallest 6-digit number is 111111.