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in Mathematics by (54.7k points)

Find the value of λ if four points with position vectors 3i+6j+9k,i+2j+3k,2i+3j+k and 4i+6j+λk are coplanar.

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Given points, A, B, C, D are coplanar if the vectors AB,AC and AD are coplanar, i.e.,

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