5. 1! + 2! + ………………. + 50! = ? a) 3.1035 * 10 64 b ) 2. 1021 * 10 65 c) 3.1035 * 10 63 d) 3.1036* 10 62

• this summation can be defined by reverse recurssion
  if you want the sum of the factorials from 1 to n then start with
  s(n) = n
  and then
  s(i) = i * ( 1 + s(i+1) )
  and s(1) gives the summation
  for example if n=4 we have
  s(4)=4
  s(3)=3*(4+1)=15
  s(2)=2*(15+1)=32
  s(1)=1*(28+1)=33
  which agrees with
  1!+2!+3!+4! = 1+2+6+24
  
  using a computer program and using this recurssion method I get the sum as
  31035053229546199656252032972759319953…
• 12 years agoHelpfull: Yes(1) No(1)
• this que. itself is not clear i guess...>?????
  
• 12 years agoHelpfull: Yes(0) No(5)
• answer is 3.1035*10^64 ...........i don,t know the exect logic
• 12 years agoHelpfull: Yes(0) No(4)
• 12624550unit digit will be 3 while none of the options will lead to unit digit 3 so no option will be correctFor 1 unit digit will be 52unit digit will be 13unit digit will be 54unit digit will be 64
• 10 years agoHelpfull: Yes(0) No(0)