There are 15 combinations.
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Well honey, there are 4 numbers in your combination, so it's as simple as 4 factorial, which is 4 x 3 x 2 x 1, giving you a total of 24 combinations using the numbers 1, 4, 6, and 9. That's all there is to it, no need to complicate things.
Number of combinations = 59*58*57*56*55/(5*4*3*2*1) = 5006386.
Oh, dude, let me break it down for you. So, if you have 4 options for the first digit, 5 for the second, 6 for the third, and 7 for the fourth, you just multiply those numbers together. So, 4 x 5 x 6 x 7 equals 840 possible combination codes. Easy peasy, right?
98,706,816
There are infinitely many numbers divisible by 5 and 4. 680 is one of them.