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** Q 2661691525. ** Find the shortest distance and the vector equation of the line of shortest distance between the given by `vec r = 3 vec i + 8 vec j + 3 vec k + lambda(3 vec i- vec j + vec k)` and `vec r -3 vec i- vec j + 6 vec k + mu(-3 vec i + 2 vec j + 4 vec k)`.