Agniveer Vayu or IAF Group X 13 July 2021 Shift 1 Paper

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Question : 36 of 70
 
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If  $a↖{→} = 2i↖{\^} + 2j↖{\^} + 2k↖{\^}$ and $b↖{→} = 4i↖{\^}−3j↖{\^}−λ k↖{\^}$  perpendicular, then what is the value of λ
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