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The position vectors of the vertices ...

The position vectors of the vertices `A ,Ba n dC` of a triangle are three unit vectors ` vec a , vec b ,a n d vec c ,` respectively. A vector ` vec d` is such that ` vecd dot vec a= vecd dot vec b= vec d dot vec ca n d vec d=lambda( vec b+ vec c)dot` Then triangle `A B C` is a. acute angled b. obtuse angled c. right angled d. none of these

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