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5. Let [(a,b,c),(b,c,a),(c,a,b)] , where...

5. Let `[(a,b,c),(b,c,a),(c,a,b)]` , where a+b+ c>0 and abc=1 .if `A^TA=I`then the value of `(a^3+b^3+c^3)/4` is (A)1 (B)2 (C)0 (D) 4

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