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

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

1.	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.	\[{{30}^{o}}\]
Answer» B. \[{{90}^{o}}\]

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

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