If 1/b+c, 1/c+a and 1/a+b are in AP, then a^2, b^2 and c^2 are in (a) geometric progression. (b) ...

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If 1/b+c, 1/c+a and 1/a+b are in AP, then a^2, b^2 and c^2 are in
(a) geometric progression.
(b) arithmetic progression.
(c) harmonic progression.
(d) None of these

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