The factorial of a non negative integer‚n denoted by n!, is the product of all positive integers less than or equal to n. For example 5! Is 5*4*3*2*1=120. The sum of the series 1(1!)+2(2!)+3(3!)+....+2012(2012!) is

• 1(1!)=1 --->2!-1
  1(1!)+2(2!)=1+4=5 --->3!-1
  1(1!)+2(2!)+3(3!)=1+4+18=23--->4!-1
  -
  -similarly
  1(1!)+2(2!)+3(3!)+........+2012(2012!)=2013!-1
• 10 years agoHelpfull: Yes(32) No(1)
• 2013!-1 is the answer
• 10 years agoHelpfull: Yes(1) No(0)