Oh, what a happy little question! On a 3-number lock, there are 1,000 possible combinations. Isn't that just wonderful to think about? Just remember to take your time and enjoy the process of finding the right combination, like painting a beautiful landscape!
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In most 3-number locks, each number ring offers a choice of 10 digits, from 0 to 9. I that case, there are 103 = 1000 combinations.
There are 6C3 = 20 such combinations.
You can make 5 combinations of 1 number, 10 combinations of 2 numbers, 10 combinations of 3 numbers, 5 combinations of 4 numbers, and 1 combinations of 5 number. 31 in all.
There are 7C4 = 7!/(4!*3!) = 7*6*5/(3*2*1) = 35 combinations.
13579
There is 345, 354, 435, 453, 543, 534.