A) \[({{a}_{1}}\mathbf{i}+{{a}_{2}}\mathbf{j}+{{a}_{3}}\mathbf{k})+t({{b}_{1}}\mathbf{i}+{{b}_{2}}\mathbf{j}+{{b}_{3}}\mathbf{k})\]
B) \[({{a}_{1}}\mathbf{i}+{{a}_{2}}\mathbf{j}+{{a}_{3}}\mathbf{k})-t({{b}_{1}}\mathbf{i}+{{b}_{2}}\mathbf{j}+{{b}_{3}}\mathbf{k})\]
C) \[{{a}_{1}}(1-t)\mathbf{i}+{{a}_{2}}(1-t)\mathbf{j}+{{a}_{3}}(1-t)\mathbf{k}+({{b}_{1}}\mathbf{i}+{{b}_{2}}\mathbf{j}+{{b}_{3}}\mathbf{k})t\]
D) None of these
Correct Answer: C
Solution :
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