what is the average of 1st 200 in the terms of the series of 1,-2,3,-4,5,-6,7....
a)-0.5 b)-50.5 c)0.5 d)50

• 
  [(1-2)+(3-4)+(5-6)+......+(199-200)]/200
  [-1-1-1-1.....-1]/200
  -100/200
  -1/2
  -0.5ans
  
• 10 years agoHelpfull: Yes(30) No(0)
• sum of first 200 odd numbers=10000
  sum of first 200 even numbers=-10100
  => (10000-10100)/200= -1/2
  => -0.5 ANS
• 10 years agoHelpfull: Yes(5) No(0)
• a) -0.5
  sum of every 2 no. is -1.
  For 200 numbers its -100.
  -100/200 = -0.5
• 10 years agoHelpfull: Yes(3) No(0)
• a.-0.5
  answer will be -0.5
• 10 years agoHelpfull: Yes(2) No(0)
• a)-0.5
  
  -1*100/200=-1/2
  =-0.5
• 10 years agoHelpfull: Yes(2) No(0)
• ans is .5
  sum of odd no. = 10000
  sum of all no = 20100
  sum of even no= sum of all no - sum of odd no
  = 20100-10000
  =100
  
  total no=200
  avg =100/200
  =0.5
• 10 years agoHelpfull: Yes(1) No(2)
• -0.5..correct
• 9 years agoHelpfull: Yes(1) No(0)