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Let α and β be the roots the equation px 2 + qx − r = 0, where p ≠ 0. If p, q and r be the consecutive terms of a non-constant G.P. and 1 α + 1 β = 3 4 , then the value of ( α – β ) 2 is :

1. 80 9
2. 9
3. 8
4. 20 3

Correct answer: 80 9

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