If sum of terms is ap^2+bp then find the CD
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Sum of 1 term = First term = ap²+bp
= a+b
Sum of two terms = a×2²+b×2 = 4a+2b
Sum of two terms = First term + Second term
4a+2b = a+b+ Second term
Second term = 3a+b
Therefore,
common difference = Second term - First term
d = 3a+b-a-b = 2a
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