I'm still not sure it's correct. cola(9, array(1, 2)) returns 2 instead of 1.
cola(9, array(1, 2))
Hm, you're right. It looks like I didn't test it thoroughly enough yesterday, and the tests I did came back with the right answers for the wrong reason. I'm trying to get better at solving math problems so I'll look more into this when I'm off work.
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