Zero Factorial - Numberphile
0! = 1 Dr James Grime tries to explain why this is the case - follow James on Twitter at https://twitter.com/jamesgrime More links & stuff in full description below ↓↓↓ Regarding the...
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JAMES GRIME: Today, we're going to talk about one of thequestions that we get sent in a lot at Numberphile, and thequestion is-- well, Brady, what's the question?BRADY HARAN: The question is, why does 0 factorial equal 1?JAMES GRIME: Right.Why does 0 factorial equal 1?So let's start off with a quick recap of what afactorial is.For our whole number, let's pick a number n--n factorial, which is written like that. n with anexclamation mark.This is equal to.You multiply all the whole numbers lessthan or equal to n.It's n multiplied by n minus 1 multiplied by n minus 2multiplied by--and you keep going down, and you'll go down to 3times 2 times 1.Quick example.Let's do 5 factorial.5 times 4 times 3 times 2 times 1.And you...
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JAMES GRIME: Today, we're going to talk about one of thequestions that we get sent in a lot at Numberphile, and thequestion is-- well, Brady, what's the question?BRADY HARAN: The question is, why does 0 factorial equal 1?JAMES GRIME: Right.Why does 0 factorial equal 1?So let's start off with a quick recap of what afactorial is.For our whole number, let's pick a number n--n factorial, which is written like that. n with anexclamation mark.This is equal to.You multiply all the whole numbers lessthan or equal to n.It's n multiplied by n minus 1 multiplied by n minus 2multiplied by--and you keep going down, and you'll go down to 3times 2 times 1.Quick example.Let's do 5 factorial.5 times 4 times 3 times 2 times 1.And you...
