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Q.

The angle between the vectors $a$ and $b$ is $60^{o} .$ Then the angle between $- 2 a$ and $3 b$ is

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a

$120^{\circ}$

b

$150^{\circ}$

c

$30^{\circ}$

d

$90^{\circ}$

answer is A.

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Detailed Solution

$angle between a, b = 60^{\circ} angle b e t w e e n - 2 a and 3 b in = 120^{\circ}$

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