1.

If bara, barb, barc is a right handed system, barb is perpendicular to both bara & barc , if (bara,barc)=cos^(-1)(4/5),abs(bara)=1,abs(barb)=2,abs(barc)=3 then abs(barabarbbarc)=

Answer»

`-18`
`18/7`
`18/5`
18

Answer :C


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