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If alpha, beta and gamma are three conse...

If `alpha, beta and gamma` are three consecutive terms of a non-constant G.P. such that the equations `ax^(2) + 2beta x + gamma = 0 and x^(2) + x - 1= 0` have a common root, then `alpha (beta + gamma)` is equal to

A

0

B

`alpha beta`

C

`alpha gamma`

D

`beta gamma`

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The correct Answer is:
D
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