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7.Let vec a,vec b and vec c be three uni...

7.Let `vec a,vec b` and `vec c` be three unit vectors such that `vec a+vec b+vec c=vec 0` .If `lambda=vec a*vec b+vec b*vec c+vec c*vec a`,`vec d=vec a timesvec b+vec b timesvec c+vec c timesvec a` ,then the ordered pair `(lambda,vec d)` is equal to , `1) (-(3)/(2),3vec c timesvec b)` `2) ((3)/(2),3vec a timesvec c)` `3) (-(3)/(2),3vec a timesvec b)` `4) ((3)/(2),3vec b timesvec c)`

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