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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 are 8C6 = 8*7/(2*1) = 28 combinations.
There are: 7C6 = 7
137, 173, 317, 371, 713, 731 Six combinations can be made.
Using the formula n!/r!(n-r)! where n is the number of possible numbers and r is the number of numbers chosen, there are 13983816 combinations of six numbers between 1 and 49 inclusive.