the first term of an AP is 100 and sum of first 6 terms is five times the sum of next 6 terms the common difference is

• Ans is -10
  the common diffeence is -10
  the AP series IS 100,90,80,70,60,50,40,30,20,10,0,-10
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• sum of first 6 terms is (a+a+d+a+2d+a+3d+a+4d+a+5d)=600+15d
  sum of next six terms is (a+6d+a+7d+a+8d+a+9d+a+10d+a+11d)=600+51d
  600+15d=5(600+51d)
  240d=-2400
  d=-10
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