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Area of a rectangle having vertices A, B, C and D with position vectors `- hat i+1/2 hat j+4 hat k , hat i+1/2 hat j+4 hat k , hat i-1/2 hat j+4 hat k`and `- hat i-1/2 hat j+4 hat k`respectively is(A) 1/2 (B) 1 (C) 2 (D) 4

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