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