If abc ne 0 and the system of equations ...

If abc `ne` 0 and the system of equations
x + 7 ay + 2az = 0, x + 6 by + 2 bz = 0,
x + 5cy + 2cz = 0 has a non-zerotrivial solution, then a,b,c are in

A

harmonic progression

B

geometric progression

C

arithmetic progression

D

arithmetic-geometric progression

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The correct Answer is:

A

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