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Find the value of lambda , if four point...

Find the value of `lambda` , if four points with position vectors `3 hati + 6 hatj + 9 hatk, hati + 2 hatj + 3 hatk, 2 hati + 3 hatj + hatk and 4 hati + 6 hatj + lambdahat k` are coplanar.

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`AB=(-2,-4,-6)`,
. `AC=(-1,-3,-8)`
`AD=(1,0,lambda-9)`
As, all these vectors are coplanar, So `|(-2,-4,-6), (-1.-3,-8),(1,0,lambda-9)|=0`Hence, `Lambda=2`
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