Sum of the series(1*1!+2*2!+3*3!+.......................................+2012*2012!)

• 1*1!=2!-1
  1*1!+2*2!=3!-1
  1*1!+2*2!+3*3!=4!-1
  ......
  (1*1!+2*2!+3*3!+............+2012*2012!)=2013!-1
• 10 years agoHelpfull: Yes(20) No(0)
• 1*1!=2!-1!
  2*2!=3!-2!
  :
  :
  2012*2012!=2013!-2012!
  Adding all the above terms we get the sum as (2013!-1!).
• 10 years agoHelpfull: Yes(4) No(0)
• ans is 2013!-1!
• 10 years agoHelpfull: Yes(2) No(0)
• 2013!-1 no doubt is correct one
  
• 10 years agoHelpfull: Yes(1) No(0)
• 1x1!=1
  2x2!=4
  1x1!+2x2!=5==>3!-1
  similiarly
  1x1!+2x2!+3x3!=23==>4!-1
  hence
  sum of series== 2013!-1
• 10 years agoHelpfull: Yes(1) No(0)