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OpenStudy (anonymous):
Prove 0! =1
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OpenStudy (anonymous):
n!=n(n-1)! when n=1 1! = 1 (1-1)! 1! = 1(0!) => 0!=1 hence proved
OpenStudy (ash2326):
we know n!=n*(n-1)! put n=1 1!=1(1-1)! 1!=1*0! 1=0! so 0!=1
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