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DRW Trading Software Engineering Interview Question (student candidate)

I interviewed in North Chicago, IL and was asked:
"how many ways to permute coins, and then what if you can rotate the positions of the coins,"
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Part of a Software Engineering Interview Review - one of 43 DRW Trading Interview Reviews

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Someone else had this same problem. It's just combinatorics. The second part is really group theory, but you can just figure it out. You might not be able to figure it out in the time they give you so you might as well practice before you guy. I assume the other people will also know how to do these before they go.
- Interview Candidate on Feb 9, 2012

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