If `Delta ABC` is right angled at A, where `A-=(4, 2, 3), B-=(3, 1, 8) – InterviewSolution

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1.	If `Delta ABC` is right angled at A, where `A-=(4, 2, 3), B-=(3, 1, 8)` and `C-=(x,-1,2)`, then x =A. -4B. -2C. 2D. 4
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