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Let vector a  = 3i + 2j + 2k and b = i + 2j - 2k be two vectors. If a vector perpendicular to both the vectors a + b and a - b has the magnitude 12 then one such vector is :

(1)   4(2i - 2j - k)

(2)   4(-2i -2j + k)

(3)   4(2i + 2j + k )

(4)   4(2i + 2j - k) 

1 Answer

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Correct option (1)   4(2i - 2j - k)


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