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If α , β and γ are three consecutive terms of a non-constant G.P. such that the equations α x 2 + 2 β x + γ = 0 and x 2 + x – 1 = 0 have a common root, then α ( β + γ ) is equal to :

1. αγ
2. 0
3. αβ
4. βγ

Correct answer: βγ

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