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[" 66.The vector "vec P=ai+aj+3hat k" an...

[" 66.The vector "vec P=ai+aj+3hat k" and "vec Q=ai-2hat j-k" are "],[" perpendicular to each other.The positive value of "],[a" is: "],[[(1)3,(2)2],[(3)1," (4) "28ro]]

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