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If w=5ij+5k,u=2i+aj+5k\vec { w } = 5 \vec { i } - \vec { j } + 5 \vec { k } , \quad \vec { u } = 2 \vec { i } + a \vec { j } + 5 \vec { k }

Question 71

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If w=5ij+5k,u=2i+aj+5k\vec { w } = 5 \vec { i } - \vec { j } + 5 \vec { k } , \quad \vec { u } = 2 \vec { i } + a \vec { j } + 5 \vec { k } find the value of a making W\vec { W } and u\vec { u } perpendicular.

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