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A unit vector parallel to the intersecti...

A unit vector parallel to the intersection of the planes `vecr.(hati - hatj + hatk) =5 and vecr.( 2 hati + hatj - 3 hatk) =4` is

A

`pi/2`

B

`pi/4`

C

`pi/6`

D

`(3pi)/(4)`

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The correct Answer is:
B, D
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