proof for 1!=0

• how is this possible we all know that 1!=1 then also if we try as follows of course without applying any conditions ,
  n!=n(n-1)
  now put n=1
  1!=1(1-1)
  1!=0
• 11 years agoHelpfull: Yes(1) No(2)
• If u want to prove, try this logic ...:P
  n!= n*(n-1)!
  1!= 1*0!= 1*0=0
• 11 years agoHelpfull: Yes(1) No(0)
• n!=n(n-1)
  now put n=1
  1!=1(1-1)
  1!=0
• 11 years agoHelpfull: Yes(0) No(2)
• ans= 1!=1 (given statement, 1!=0 is wrong)
  if anyhow it should be proved then proofs given by Jasmine and Faisal are correct.
• 11 years agoHelpfull: Yes(0) No(1)
• n!=n*(n-1)!
  we have decrease n upto 1 . if not all factorials will be zero so
  1!=| 0
• 11 years agoHelpfull: Yes(0) No(0)