6! = 6*5*4*3*2*1 = 720
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216
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.
Assuming no repeated digits, lowest first, 20; in any order 120; Allowing repeated digits: 216
6 different combinations can be made with 3 items
There are 9C3 = 84 combinations.