1.
The vectors a=i^+2j^+3k^\vec{a} = \hat{i} + 2\hat{j} + 3\hat{k}, b=2i^j^+k^\vec{b} = 2\hat{i} - \hat{j} + \hat{k} and c=3i^+j^+4k^\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