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A non-zero vector vec a is parallel to t...

A non-zero vector `vec a` is parallel to the line of intersection of the planes determined by the vectors i, i+j and the plane determined by the vectors i-j, j+k. The angle between `vec a` and i-2j+2k is

A

`pi/2`

B

`pi/3`

C

`pi/6`

D

`pi/4`

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The correct Answer is:
D
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