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Q: How many 6 digit numbers can be formed using the digits 123456789?

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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 3024 of them.

-123456785

-123456787

There are 504 such numbers.

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.

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

-123456786

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

24

500

840

180 of them.

There are 5! = 120 such numbers.

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

1 set

It is 120 if the digits cannot be repeated.

I take it that you want to make three digits numbers with 8,7,3, and 6 without repetition. The first digit cane be selected from among 4 digits, the second from 3 digits, the third digit from 2, hence the number of three digit numbers that can be formed without repetition is 4 x 3 x 2 = 24

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.

There are 34 = 81 numbers.

6!

There are 900 of them.

More than one

48 of them if digits may not be repeated. 100 if they can.

There are 3 values (1, 2, 3) for each of the 4 digits. Therefore, there are 3*3*3*3 or 81 four digit numbers that can be formed.

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