What is the logarithmic mean of r1 and r2 ?
(A) (r1 – r2)/ln(r1/r2)
(B) (r1 – r2)/ln(r2/r1)
(C) (r2 – r1)/ln(r1/r2)
(D) (r1 – r2)/-ln(r1/r2)
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