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[" Q.28If "vec a*vec b,vec c" are three ...

[" Q.28If "vec a*vec b,vec c" are three non-zero coplanar vectors so "],[" that "vec a*vec b=0" and "vec b*vec c=0" ,then- "],[qquad [" (A) "vec a*vec c=0," (B) "vec a*vec c!=0],[" (C) "vec a*vec c>0," (D) None of these "]]

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