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Let a G = k ˆ j ˆ 2 i ˆ + + , b G = ) k ˆ j ˆ – i ˆ ( 3 + . Let c G be the vector such that b c a G G G = × and c · a G G = 3. Then ) c – b – ) b c (( · a G G G G G × is equal to :

1. 24
2. 20
3. 32
4. 36

Correct answer: 24

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