question_answer

Vectors \[\vec{a}=\hat{i}+2\hat{j}+3\hat{k};\,\,\vec{b}=2\hat{i}-\hat{j}+\hat{k}\] and \[\vec{c}=3\hat{i}+\hat{j}+4\hat{k}\] are so placed that the end point of one vector is the starting point of the next vector. Then the vectors are-

A) Not coplanar

B) coplanar but cannot form a triangle

C) coplanar and form triangle

D) coplanar and can form a right-angled triangle