If a, b and c are positive numbers in arithmetic progression. and a^2, b^2 and c^2 are in geometr...

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If a, b and c are positive numbers in arithmetic progression. and a^2, b^2 and c^2 are in geometric progression, then a^3, b^3 and c^3 are in
(A) arithmetic progression.
(B) geometric progression.
(C) harmonic progression.
(a) (A) and (B) only
(b) only (C)
(c) (A), (B) and (C)
(d) only (B)

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