R1.23 computed by
A. $$\frac{{{r^2}_{12} + {r^2}_{23} + {r^2}_{13}}}{{\sqrt {1 - {r^2}_{23}} }}$$
B. $$\sqrt {\frac{{{r^2}_{12} + {r^2}_{13} - 2{r_{12}}{r_{13}}{r_{23}}}}{{1 - {r^2}_{23}}}} $$
C. $$\sqrt {\frac{{{r^2}_{12} + {r^2}_{23} + {r^2}_{13}}}{{r - 1}}} $$
D. None of these
Answer: Option B
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