42C6 = 5245786
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42!/(36! x 6!) where the "!" represents factorial. Simplifies to (42 x 41 x 40 x 39 x 38 x 37)/(6 x 5 x 4 x 3 x 2) 5,245,786
7
10 * * * * * That is just plain wrong! It depends on how many numbers in each combination but there are 1 combination of 4 numbers out of 4, 4 combinations of 3 numbers out of 4, 6 combinations of 2 numbers out of 4, 4 combinations of 1 number out of 4. A grand total of 15 (= 24-1) combinations.
6! = 720
There are 8,592,039,666 combinations of 6 numbers out of 138 numbers, like the numbers from 1 to 138.