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प्रश्न
Choose the correct alternative:
If `lambdahat"i" + 2lambdahat"j" + 2lambdahat"k"` is a unit vector, then the value of `lambda` is
विकल्प
`1/3`
`1/4`
`1/9`
`1/2`
उत्तर
`1/3`
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