Find the average of the terms of the series 1 -2 +3 -4 +5 -6 +7+..... +199 -200.

• 1-2+3-4+5-.....+199-200=-100
  -100/200=-1/2
  Ans:-1/2
• 11 years agoHelpfull: Yes(21) No(6)
• sum in ap=n/2(2a+(n-1)d)
  upto 200 no.of odd=num of even =100
  sum of odd-sum of even=-100
  averg=100/200=1/2
• 11 years agoHelpfull: Yes(1) No(2)
• -100/200 = -1/2 Ans.
• 11 years agoHelpfull: Yes(0) No(0)