Question
Sat December 01, 2012 By:

can u plz explain how 0!=1 and not 0??

Expert Reply
Sat December 01, 2012
n! denotes the numberof ways n objects can be arranged in row.
therfor 0! means number of ways of arranging 0 object that is oone way ?.
therfor 0!=1
 
or,
 n!=n(n-1)!
putting n=1 in this
1!=1*(0!)
therfor 0!=1
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