A factory produced 1100cars in the third year and 2700cars in the 11th year .Assuming that the production increases by a fixed number every year find the production of the cars in the 20th year and total cars produced in first 20 years?
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t3=1100 =a+2d=1100. &a+10d=2700 a=700&d=200. so , t20 = a+19d= 4500. s20 =520000
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