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vec p , vec q ,a n d vec r are three mu...

` vec p , vec q ,a n d vec r` are three mutually perpendicular vectors of the same magnitude. If vector ` vec x` satisfies the equation ` vec pxx(( vec x- vec q)xx vec p)+ vec qxx(( vec x- vec r)xx vec q)+ vec rxx(( vec x- vec p)xx vec r)=0,t h e n vec x` is given by a.`1/2( vec p+ vec q-2 vec r)` b. `1/2( vec p+ vec q+ vec r)""` c. `1/3( vec p+ vec q+ vec r)` d. `1/3(2 vec p+ vec q- vec r)`

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