



 
Hi Larry, You can use the Combinations and Permutations Calculator at Math Is Fun to list all the combinations. Set $n = 10, r = 3,$ set "Is order important?" to No and then in the "List Them:" box type 0,1,2,3,4,5,6,7,8,9. This will list all 220 combinations, including the ten you don't want. 111, 222, ... Print the list and delete the ten you don't want. Penny




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