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vec a , vec b , vec c are three coplanar...

` vec a , vec b , vec c` are three coplanar unit vectors such that ` vec a+ vec b+ vec c=0.` If three vectors ` vec p , vec q ,a n d vec r` are parallel to ` vec a , vec b ,a n d vec c ,` respectively, and have integral but different magnitudes, then among the following options, `| vec p+ vec q+ vec r|` can take a value equal to a. `1` b. `0` c. `sqrt(3)` d. `2`

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