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The triangle formed by the three points ...

The triangle formed by the three points whose position vectors are `2hati+4hatj-hatk, 4hati+5hatj+hatk and 3hati+6hatj-3hatk` is (A) an equilateral triangle (B) a right singled triangle but not sides (C) an isosceles triangle but not right angled triangle (D) a right angled isosceles triangle

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