A : If A = (1, -2, -1) B = (4, 0, - 3), ...

A : If A = (1, -2, -1) B = (4, 0, - 3), C = (1,2 - 1), d = (2, -4,-5) then the distance between AB and CD is 4/3
R : The shortest distance between the skew lines r = a + sb, r = c + td is `([a - c b d])/(|b xx d|)`

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