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Let vec a, vec b and vec c be three vect...

Let `vec a, vec b` and `vec c` be three vectors having magnitudes 1,1, and 2 respectively. If `vec a xx (vec a xx vec c) + vec b = vec 0`, then the angle between `vec a` and `vec c ` is

A

`pi/4`

B

`pi/6`

C

`pi/3`

D

none of these

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The correct Answer is:
B
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