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Let u G be a vector coplanar with the vectors a G k j i ˆ ˆ 3 ˆ 2 − + = and k j b ˆ ˆ + = G . If u G is perpendicular to a G and b u G G ⋅ = 24, then 2 u K is equal to:

1. 336
2. 315
3. 256
4. 84

Correct answer: 336

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