If vec a = j-k and vec c = i-j-k. Then t...

If `vec a = j-k` and `vec c = i-j-k`. Then the vector `vec b` satisfying `vec a xx vec b + vec c = vec 0` and ` vec a. vec b` = 3 is

A

`-i+j-2k`

B

2i-j+2k

C

i-j-2k

D

i+j-2k

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The correct Answer is:

A

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