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[" The position vectors of the points "A...

[" The position vectors of the points "A,B," and "C],[" are "hat i+hat j+hat k,hat i+5hat j-hat k" and "2hat i+3hat j+5hat k],[" respectively.The greatest angle of triangle "ABC],[" is - "],[[" (1) "120^(@)," (2) "90^(@)],[" (3) "cos^(-1)(3/4)," (4) None of these "]]

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