Tuesday, 10 May 2011

why is 0! equal to 1?

Since  n! = n(n-1)!
Put n =1 in it.
1! = 1x(1 – 1)!
1! =1x0!
1! = 0!
Since 1! = 1
So 1 = 0!
0! = 1.
at

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