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If ab + bc + ca = 8 and a^2+b^2+c^2=20, ...

If ab + bc + ca = 8 and `a^2+b^2+c^2=20`, then a possible value of `1/2 (a + b + c) [(a-b)^2+(b-c)^2+(c-a)^2]` is
यदि ab + bc + ca = 8 है और `a^2+b^2+c^2=20`, है, तो `1/2 (a + b + c) [(a-b)^2+(b-c)^2+(c-a)^2]` का संभावित मान है :

A

72

B

56

C

84

D

80

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