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April 18, 2015

April 18, 2015

Posted by **bandit5571** on Wednesday, May 7, 2008 at 1:21am.

- math -
**Reiny**, Wednesday, May 7, 2008 at 7:57amhere is a rather simple explanation

we know n! = n(n-1)!

e.g. 6! = 6(5!)

and 1! = 1(0!) and we know that 1! = 1

so 1 = 1(0!)

0! = 1

another way is to look at the definition of C(n,r) which are the number of subsets of n elements.

e.g. C(6,2) is the number of 2-element subsets in 6 elements, and C(6,2) = 6!/(4!2!) = 15

so C(6,0) would be the number of null subsets, which of course is 1.

there is one null subset.

but C(6,0) = 6!/(6!0!)

720 = 720/(720(0!))

so 0! has to be 1

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