1.

The vector, 2hat(i)+hat(j)+2hat(k),hat(i)+lambdahat(j)-hat(k)t" and "2hat(i)-lambdahat(k) areco-planar if

Answer»

`lambda=-2`
`lambda=1+sqrt(3)`
`lambda=1-sqrt(3)`
`lambda=-2,1pmsqrt(3)`

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