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Q: How many seven digit numbers can be made from numbers 123456789 but no repeatition of numbers allowed?

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-123456787

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

There are 504 such numbers.

There are 60480 numbers.

There are 3024 of them.

If the numbers are not allowed to repeat themselves then 362,880. * * * * * That is the number of permutations, not combinations. In a combination the order of the digits does not matter. So there is only one 9-digit combination.

123456789

The hundredths digit is 7.

98,376

The three.

123456789 Josh Griff

2

if the repetition is allowed the there is 6*6*6 possible ways = 216

The first digit can be any one of 9 choices. For each of these . . .The second digit can be any one of the remaining 8 choices. For each of these . . ....The seventh digit can be any one of the remaining 3 choices.Total possibilities = (9 x 8 x 7 x 6 x 5 x 4 x 3) = 181,440

A number divisible by 123456789 must be 0 or bigger than 123456789. It must, therefore have 1 digit or 9 digits (or more). A remainder of 1 makes no difference to the number of digits. In any case, there can be no number of 4 digits that is divisible by 123456789.

There are 504 of them.

Total possible 4-digit numbers= 1000, 1001,...,9999 = 9000 Total with same digit numbers = 1111,2222,...,9999 = 9 9000 - 9 = 8991

If repetition is allowed . . . . . 343 If repetition is not allowed . . . . . 210

-123456785

-4

64 if repetition is allowed.24 if repetition is not allowed.

24 three digit numbers if repetition of digits is not allowed. 4P3 = 24.If repetition of digits is allowed then we have:For 3 repetitions, 4 three digit numbers.For 2 repetitions, 36 three digit numbers.So we have a total of 64 three digit numbers if repetition of digits is allowed.

The number of six digit numbers that you can make from ten different digits ifrepetitions of same digit on the six digit number is allowed is 1 000 000 numbers(including number 000 000).If no repetitions of the the same digit are allowed then you have:10P6 = 10!/(10-6)! = 151 200 different six digit numbers(six digit permutations form 10 different digits).

Assuming leading zeros are not permitted, then: If repeats are not allowed there are 30 possible numbers. If repeats are allowed there are 60 possible numbers.

There are 5*5*5 = 125 such numbers.

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