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[" 71.If the vectors "(hat i+hat j+hat k...

[" 71.If the vectors "(hat i+hat j+hat k)" and "3hat i" form two sides "],[" of a triangle,the area of the triangle is "],[[" (a) "sqrt(3)," (b) "2sqrt(3)],[" (c) "(3)/(sqrt(2))," (d) "3sqrt(2)],[" Ans."," (c) "]]

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