Find the sum of 1*1!+2*2!+......2012*2012!
please solve it

• Its of form 1*1!+2*2!+..............N*N!
  Its direct formula is (N+1)!-1
  For above question (2012+1)!-1
• 11 years agoHelpfull: Yes(2) No(1)
• 1(1!)=1=2!-1
  2(2!)+1(1!)=5=3!-1
  3(3!)+2(2!)+1(1!)=23=4!-1
  :
  :
  1(1!)+2(2!)+..........+2012(2012!)=2013!-1
  ANS:2013!-1
• 11 years agoHelpfull: Yes(0) No(0)
• ans is 2013!-1!
• 11 years agoHelpfull: Yes(0) No(0)