The position vectors of the points A,B,C and D are 3i - 2j - k, 2i + 3j - 4k, -i + j + 2k and 4i + 5j + λk, respectively. If the points A,B,C and D on a plane, find the value of λ.
=> -17λ + 146 = 0
=> λ = 146/17
