1> 1*!+2*2!+3*3!.......2012*2012!=????

• nth term can b written as
  n*n!=(n+1-1)*n!=(n+1)n!-n!=(n+1)!-n1
  thus series becomes
  2!-1!+3!-2!+4!-3!+.......+2013!-2012!
  all terms will cancel out except -1! and 2013!
  result
  2013!-1
• 12 years agoHelpfull: Yes(34) No(1)
• 2013!-1... (n+1)!-1
• 12 years agoHelpfull: Yes(7) No(2)