1.

Two vertices of Delta ABC are A (1,0,0) B (2,0,0). Third vertex C lies on the line (x -1)/(1) = y/2 (z-1)/(2) and the orthocenter of Delta ABC lies on x ^(2) + 2 xy + 2 zx - 3x - 2y -z + K =0 then K equals

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