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The values of a for which the points A,B...

The values of a for which the points A,B,C with position vectors `2hati+hatj+hatk, hati-3hatj-5hatk and ahati-3hatj+hatk` respectively are the vertices of a righat angled triangle at C are (A) 2 and 1 (B) `-2 and -1` (C) `-2 and 1` (D) `2 and -1`

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