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If the system of equations x + 2ay + az = 0, x + 3by + bz = 0 and x + 4cy + cz = 0 has a non-zero solution, then a, b, c are in

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If the system of equations x + 2ay + az = 0, x + 3by + bz = 0 and x + 4cy + cz = 0 has a non-zero solution, then a, b, c are in

a. AP

b. GP

c. HP

d. none of these

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Correct option is c. HP

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