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The number of combinations of six numbers that can be made from seven numbers will depend on if you can repeat numbers. In all there are over 2,000 different numbers that can be made.
There is 1 combination of all ten numbers, 10 combinations of one number and of nine numbers, 45 combinations of two or eight numbers, 120 combinations of three or seven numbers, 210 combinations of four or six numbers and 252 combinations of five numbers. That is 1023 = 210 - 1 in total.
There are: 7C6 = 7
the first digit can be any of the seven numbers, the second can be any of the remaining 6 etc so there are 7 x 6 x 5 x 4 x 3 x 2 x 1 combinations. This is known as "factorial 7" and is normally written "7!" and is 5040.
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