A) A.P.
B) G.P.
C) H.P.
D) None of these
Correct Answer: D
By componendo and dividendo, we have $ \frac{b+a}{b-a}=\frac{b+c}{b-c}\Rightarrow \frac{b+a}{b-a}=\frac{b+c}{b-c}\Rightarrow a=c $ .
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