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Q: How many different 5-digit numbers are there if no digit is repeated?

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What is the sum of greatest 3-digit 4-digit 5digit

9x9x8x7x6x5 = 81x56x30 = 136080

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

Any 3 out of 4 = 4. Each set can be arranged 6 ways so 24 different numbers.

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

987654

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

There are 27 of them.

9

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.

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

If they can be repeated, 343 different numbers. If they can be used once each, there are only 210.

3897

36

There are 5! = 120 such numbers.

720 (10*9*8)

5 digit telephone numbers having at least one of their digits repeated is = total possible 5 digit telephone numbers - 5 digit telephone numbers without any digit being repeated. =(10*10*10*10*10)-(10*9*8*7*6) =100000-30240 =69760

81

823543

757

There are a handful of six digit numbers that have no numbers repeating. Some examples are 123456, 234567, 345678, 456789, 567012, 654321, 765432, 876543, and 987654.

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

81 As there are no limits stated then you can have a number comprising a repeated single digit (such as 2222), two pairs of numbers (e.g. 2244) or three different numbers (such as 2462). The first digit can be one of any of the 3 numbers. The second digit can be one of any of the three numbers, as can the third digit and also the fourth. Then you can have 3 x 3 x 3 x 3 = 81 different 4-digit numbers using the three given numbers.

If the digits can be repeated, then there are (5 x 5 x 5 x 5) = 625 different four-digit numbers.If the digits can't be repeated, then there are (5 x 4 x 3 x 2) = 120 different four-digit numbers.

987,654