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If two vectors `2hati+3hatj-hatk` and `-4hati-6hatj-lamdahatk` are parallel to each other then value of `lamda` be

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If two vectors `2hati+3hatj-hatk` and `-4hati-6hatj-lamdahatk` are parallel to each other then value of `lamda` be
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(b) the coefficients of `hatihatkand hatk` should be a constant ratio
Or `(2)/(-4)=(3)/(-6)=(1)/(lamda)or lamda=2`
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