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If $l, m, n$ are positive and are respectively the $p t h, q t h a n d r t h$ terms of a G.P., then
$Δ = |\begin{array}{lll} \log l p 1 \\ \log m q 1 \\ \log n r 1 \end{array}|$ is equal to

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Correct option is D

l=ARp−1,m=ARq−1,n=ARr−1Δ=a+(p−1)dp1a+(q−1)dq1a+(r−1)dr1where a=log⁡A,d=log⁡RUse C1→C1−(a−d)C3−dC3 to show ∆=0

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If l, m, n are positive and are respectively the pth, qth and rth terms of a G.P., thenΔ=log⁡l p 1log⁡m q 1log⁡n r 1 is equal to

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If $l, m, n$ are positive and are respectively the $p t h, q t h a n d r t h$ terms of a G.P., then
$Δ = |\begin{array}{lll} \log l p 1 \\ \log m q 1 \\ \log n r 1 \end{array}|$ is equal to