what is average of 2000 terms of the given series
1,-3,2,-4,3,-5,4,....
A 1
B 0.5
C -0.5
D -1

• 1-3=-2
  2-4=-2
  3-5=-2...
  we get 1000 -2s for 2000 numbers.
  for 2000 terms the average= -2(1000)/2000
  = -1
  
  Ans is -1
• 10 years agoHelpfull: Yes(31) No(0)
• 1,2,3,4,5......
  (-1,-2,-3,-4,-5......upto 1002 )+1,+2
  sum=n(n+1)/2
  n=1000
  for -ve value
  n=1002
  because 2 extra term are added
  then solve it and get the result =-1.
• 10 years agoHelpfull: Yes(1) No(0)