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If a (b - c) x^2 + b (c-a) x + c (a - b)...

If `a (b - c) x^2 + b (c-a) x + c (a - b) = 0` has equal root, then `a, b, c` are in

A

A.P.

B

G.P.

C

H.P.

D

A.G.P.

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The correct Answer is:
C
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