Mathematics · Vectors
Let a, b and c be three non-zero non-coplanar vectors. Let the position vectors of four points A, B, C and D be a - b + c, λa - 3b + 4c, -a + 2b - 3c and 2a - 4b + 6c respectively. If the vectors AB, AC and AD are coplanar, then λ is:
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