The sum of first 8 term of an AP is 100 and the sum of first 19 terms is 551.find AP
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3
S8=100
S19=551
=> S8= 8a + 78d= 100
819= 19a + 171d = 551
Solve the equations, you will get your answer
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10
The AP is 2,5,8, and so on
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