Unexpected Factorial

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When you use an exclamation mark with a number, you’re actually implying it’s not a normal number any more. It’s a factorial!

Ok, so how does this work? 5!=12345=120 6!=720 15!≈1.3*10^12

So, next time you see a headline with 2000! in it, you’ll know it’s a really big number.

There are also double factorials (n!!) and iterated factorials (n!)!, and they aren’t the same thing. Just add more exclamation marks and you get multifactorial. Check wikipedia for more info.

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