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one friend of mine got lamda=2 and another friend got -2!shukar hai i found a new thread, mujhe saray answers bhoolne lagay thay......any ways if any one remembers the coordinates of vectors, please post soon, i got under root 18 as the distance from C to line AB (perp) dist. the following was my method, form line equation for ab, subtract coordinates of C from it and mike this a dot product wit displacement of A to B and equal to zero, you get value of lambda. put lambda in line equation and get point of intersection. subtract coordinate of C from this and i got (4,1,-1) the under root (16+1+1)= under root 18.......