If `a=lambdahati+2hatj-3hatk, b=2hati+lambdahatj-hatk, c=hati+2hatj+hatk and [abc]=6`,

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If `a=lambdahati+2hatj-3hatk, b=2hati+lambdahatj-hatk, c=hati+2hatj+hatk and [abc]=6`, then `lambda` is equal to
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