9999 + 1
* * * * *
That is so wrong!
There are 10*9*8*7/(4*3*2*1) = 210 combinations of 4 numbers from the set of ten 1-digit numbers, 0 1, 2, ... 9
When considering combinations, 1234 is the same as 2314 or 4123 etc.
Actually...
4 numbers to be arranged with ten different possibilities each will give a total of 10^4 combinations, or 10,000.
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56 combinations. :)
7
Number of 7 digit combinations out of the 10 one-digit numbers = 120.
Just one. unless you count 123456 different from 132456 then there are 46656 * * * * * But you cannot count 123456 as different from 132456 since it is NOT a different combination. And the question was about combinations.
1000