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You can make three different groups of three out of nine. 9/3=3
9
Any 6 from 10 = 10 x 9 x 8 x 7 = 5040
there is 6 9 in 54
There are different numbers of combinations for groups of different sizes out of 9: 1 combination of 9 digits 9 combinations of 1 digit and of 8 digits 36 combinations of 2 digits and of 7 digits 84 combinations of 3 digits and of 6 digits 126 combinations of 4 digits and of 5 digits 255 combinations in all.