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Que. Let V1 = 2I – J + K and V2 = I + J – K, then the angle between V1 & V2 and a vector perpendicular to both V1 & V2 shall be :
a. 90 degrees and (–2I + J – 3K) 
b. 60 degrees and (2I + J + 3K)
c. 90 degrees and (2I + J – 3K)
d. 90 degrees and (–2I – J + 3K)
Answer:90 degrees and (–2I – J + 3K)
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