So wise.
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[–] 9 points 4 months ago (10 children)
  • [–] 6 points 4 months ago* (last edited 4 months ago) (9 children)

    0! is 0.

    Edit. I remembered wrong. Keeping it like this as it is funnier that way.

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  • [–] 4 points 4 months ago (1 child)

    factorials are mostly encountered in combinatorics, which is problems like, how many ways are there to put 3 objects of different colors in a row? well, the first can be any of the 3, the second can be either of the other 2, and the last is whichever 1 is left, so 3×2×1=3!=6

    so how many ways are there to put 0 objects in a row? well there's 1, it's this one:

    ‎
    ‎

    that's why 0!=1

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  • [–] 2 points 4 months ago (3 children)