question_answer

If the angle between a and b be \[{{30}^{o}}\], then the angle between 3 a and ? 4 b will be

A)             \[{{150}^{o}}\]

B)             \[{{90}^{o}}\]

C)             \[{{120}^{o}}\]

D)             \[{{30}^{o}}\]

Correct Answer: A

Solution :

           It is obvious from figure.