SOLUTION: What are the 21 unique sets of 5 numbers formed from the 7 digits, 1 through 7?

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Question 1038624: What are the 21 unique sets of 5 numbers formed from the 7 digits, 1 through 7?
Answer by Boreal(15235) About Me  (Show Source):
You can put this solution on YOUR website!
I'd pick the sets of 2 that aren't used.
12---34567
13---24567
14--23567
15--23467
16--23457
17--23456
23--14567
24--13567
25--13467
26--13457
27--13456
34--12567
35--12467
36--12457
37--12456
45--12367
46--12357
47--12356
56--12347
57--12346
67--12345