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JEE MATHEMATICS MCQ: ADDITION OF VECTORS

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If three points A,BA, B and CC have position vectors (1,x,3),(3,4,7)(1, x, 3),(3,4,7) and (y,−2,−5)(y,-2,-5) respectively and if they are collinear, then (x,y)=(x, y)=
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Correct option: A
(2,−3)(2,-3)
Option A ((2,-3)) is correct because if the points are collinear, the vectors formed by them are proportional, allowing us to solve for x and y.

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Let a=i^−j^,b=j^−k^\mathbf{a}=\hat{\mathbf{i}}-\hat{\mathbf{j}}, \mathbf{b}=\hat{\mathbf{j}}-\hat{\mathbf{k}} and c=k^−i^\mathbf{c}=\hat{\mathbf{k}}-\hat{\mathbf{i}}. If d\mathbf{d} is aa unit vector such that a⋅d=0=(bc\mathbf{a} \cdot \mathbf{d}=0=(b \mathbf{c} ) , then d\mathbf{d} is equal to
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