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OpenStudy (anonymous):
(n+1)!/(n-1)!=20 n!=?
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mathslover (mathslover):
first of all what is (n+1)!
mathslover (mathslover):
@mitchelsewbaran please reply to my question
OpenStudy (anonymous):
idk. this is why i'm asing the question to c if any one knows
mathslover (mathslover):
(n+1)! = 1*2*3*4*..*n-1*n*n+1
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