A) \[2.87\,\,BM\]
B) \[3.87\,\,BM\]
C) \[3.47\,\,BM\]
D) \[3.67\,\,BM\]
Correct Answer: B
Solution :
\[C{{r}^{3+}}=3{{d}^{3}};\] Hence,\[\mu =\sqrt{n(n+2)}\] \[BM=\sqrt{3(3+2)}=\sqrt{15}=3.87\,\,BM\]
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