find the sum of 1!+2!+31+...+100!

• we can write
  100!+99!+.......+1!
  now
  100!(1+99!/100!+98!/100!+......1!/100!)
  after 99!/100 value is too small and before 1!/100! is to large)
  then finally
  100!(1+99!/100*99!)
  =100!(1+1/100)
  =100!*1.01
  ans-100!*1.01
• 11 years agoHelpfull: Yes(1) No(0)