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

• 1*1!+2*2!=3!-1
  1*1!+2*2!+3*3!=4!-1
  ......so on
  similarly
  1*1!+2*2!+3*3!........+2012*2012!=2013!-1
  
• 11 years agoHelpfull: Yes(22) No(0)
• 1*1!+2*2!+3*3!+.........+n*n!=(n+1)!-1
  therefore answer is 2013!-1
  
• 11 years agoHelpfull: Yes(4) No(0)
• 1*1!+2*2!+3*3!....+2012*2012!=2*1!-1!+3*2!-2!+4*3!-3!+..+2013*2012!
  =2*1!+3*2!+4*3!+..2013*2012!-1!-2!-3!-..-2012!
  =2!+3!+4!+..+2013!-1!-2!-3!...-2012!
  =2013!-1
• 11 years agoHelpfull: Yes(1) No(0)
• 1*1!+2*2!+3*3!........+2012*2012!=2013!-1
  
• 11 years agoHelpfull: Yes(0) No(0)