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vec a , vec b ,a n d vec c are three vec...

` vec a , vec b ,a n d vec c` are three vectors of equal magnitude. The angel between each pair of vectors is `pi//3` such that `| vec a+ vec b+ vec c|=6.` Then `| vec a|` is equal to `2` b. `-1` c. `1` d. `sqrt(6)//3`

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