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Let k ˆ 5 i ˆ 3 b ˆ , k ˆ j ˆ 7 i ˆ 2 a       and k ˆ 2 j ˆ i ˆ c     . Let d  be a vector which is perpendicular to both a  and b  , and c  . d  = 12. Then ) d c ( ). k ˆ j ˆ i ˆ (       is equal to -

1. 24
2. 44
3. 42
4. 48

Correct answer: 44

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