If the position vectors of the vertices a triangle be \( \mathrm{P}...

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If the position vectors of the vertices a triangle be
\( \mathrm{P} \) \( 2 \hat{i}+4 \hat{j}-\hat{k}, 4 \hat{i}+5 \hat{j}+\hat{k} \) and \( 3 \hat{i}+6 \hat{j}-3 \hat{k} \), then the

W triangle is:
(1) right angled
(2) isosceles
(3) equilateral
(4) None of these
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