Find lambda for which the points A(3,\ 2...

Find `lambda` for which the points `A(3,\ 2,\ 1),\ B(4,\ lambda,\ 5),\ C(4,\ 2,\ -2)\ a n d\ D(6,\ 5,\ -1)` are coplanar.

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The correct Answer is:

x = 5.

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