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Two make combinations you would take 2x1=2 combinations only
20
720
42 combinations.
you can make 6
There is only one combination and that is AABBCC. There are 90 permutations. Some of these are: AABBCC, AABCBC, AABCCB, AACBBC, AACBCB, AACCBB, ABABCC, ABACBC, ABACCB, ABBACC, ABBCAC, ABBCCA, ABCABC, ABCACB, ABCBAC, ABCACB, ABCCAB, ABCCBA, etc.
Abc
Two make combinations you would take 2x1=2 combinations only
You could make 10*10*10*26*26*26 combinations, or 17576000 combinations.
Assuming you are using the standard English alphabet, the number of combinations you can make are: 26 x 26 = 676 combinations.
9
8x7x6x5x4x3x2x1
23
You can make 5 combinations of 1 number, 10 combinations of 2 numbers, 10 combinations of 3 numbers, 5 combinations of 4 numbers, and 1 combinations of 5 number. 31 in all.
20
14 combinations.
25 different combinations.