I know this may seem like a homework question, but it really isn't. Some of my friends and I were debating the reason that they would use an exclamatin point with factorials. One of us joked and said it was because they produced large numbers so it was like a "wow" factor haha. Anyway, I personally thought it was just because since we couldn't find any proof as to why they would use the "!". But we have a bet going and I've searched google, but I could only come up with one site that helped even a little and all it did was state who had invented factorials which was only partially helpful. Our teacher said she would consider giving us extra credit, but I'd rather just know why (I'm like that, it's weird). But anyway, thanks in advance for any links you can supply.
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