Just one.
The order of the element in a combination does not matter.
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11*3*3 = 99 combinations.
13 combinations of 3
3 x 5 = 15
14 * * * * * Wrong! There are 15. 4 combinations of 1 number, 6 combinations of 2 number, 4 combinations of 3 numbers, and 1 combination of 4 numbers.
137, 173, 317, 371, 713, 731 Six combinations can be made.