If \( { }^{56} \mathrm{P}_{\mathrm{r}+6}:{ }^{54} \mathrm{P}_{\math...

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If \( { }^{56} \mathrm{P}_{\mathrm{r}+6}:{ }^{54} \mathrm{P}_{\mathrm{r}+3}=30800 \), then \( \mathrm{r} \) is
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