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Given three non-zero, non-coplanar vec...

Given three non-zero, non-coplanar vectors ` vec a , vec b ,and vec c . vec r_1=p vec a+q vec b+ vec ca n d vec r_2= vec a+p vec b+q vec c dot` If the vectors ` vec r_1+2 vec r_2 and 2 vec r_1+ vec r_2` are collinear, then `(P ,q)` is a. `(0,0)` b. `(1,-1)` c. `(-1,1)` d. `(1,1)`

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