A) 1
B) 2
C) 2.5
D) 3
Correct Answer: C
Solution :
\[\text{B}\text{.O}\text{.}=\frac{\text{No}\text{. of }{{N}_{b}}-\text{No}\text{. of }{{N}_{a}}}{2}\]\[=\frac{5}{2}=2.5\].
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