consider the sequence 1 ,-2, 3, -4,5,-6....what is the average of first 200 terms of sequence?

• average = 1+(-2)+ 3+( -4)+5+(-6)...++199+ (-200) /200
  
  =(1-2)+ (3-4)+(5-6)...+(199-200) / 200
  
  = (-1 -1 -1 .............100 times) / 200
  
  = -100/200
  
  = -1/2
  = -.5
• 9 years agoHelpfull: Yes(29) No(0)
• Ans: -0.50
• 9 years agoHelpfull: Yes(0) No(0)
• sum of all 200 terms in series is (-100)
  -100 comes from (1-2)+(3-4)+(5-6)....+(199-200)=-1,-1,-1,-1,-1,...-1
  =>-100/200
  =.5
• 9 years agoHelpfull: Yes(0) No(1)
• 1
  2
  3
  4
  5
  6
  7
  89
  so finally the answer is -0.5
• 9 years agoHelpfull: Yes(0) No(0)
• (1-2+3-4+5-6)=-3
  average is (-3/6)=-0.5
  thus sum for(1-2+3......................200)=-100
  average is (-100/200)=-0.5
  
  
  
• 9 years agoHelpfull: Yes(0) No(0)