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Q)

If $ln (a+c), ln (a-c),ln(a-2b+c)$ are in A.P , then

$\begin{array}{1 1} a,b,c\;are \;in \;A.P \\ a^2,b^2,c^2\;are\;in\;A.P \\a,b,c\;are\;in\;G.P \\ a,b,c\;are\;in\;H.P \end{array} $

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