A) \[\frac{a+b}{2}\]
B) \[\frac{a+b}{3}\]
C) \[\sqrt{\frac{{{a}^{2}}+{{b}^{2}}+ab}{2}}\]
D) \[\sqrt{\frac{{{a}^{2}}+{{b}^{2}}+ab}{3}}\]
Correct Answer: B
Solution :
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