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[" 17.Let "vec u" be a vector coplanar w...

[" 17.Let "vec u" be a vector coplanar with the vectors "vec a=2hat i+3hat j-hat k" and "vec b=hat j+hat k*" If "vec u" is perpendicular to "vec a" and "],[vec u*vec b=24," then "|vec u|^(2)" is equal to "],[[" (A) "256," (B) "84," (C) "336," (D) "315]]

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