Ethan S.

asked • 09/28/18

How does this make sense?

Why does 0! = 1?

1 Expert Answer

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Victoria V. answered • 09/28/18

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Math Teacher: 20 Yrs Teaching/Tutoring CALC 1, PRECALC, ALG 2, TRIG

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It is defined that way.  It doesn't have to "make sense", but it does have to work in every math situation.  And it turns out that if we define 0! = 1, then it works in every math situation where it shows up.  It may not "make sense", but it works!
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