If the line joining the points (−1,2,3),(2,−1,4) is perpendicular to the line joining the points  (x,−2,4),(1,2,3) then x=

D.r’s of the line joining (−1,2,3),(2,−1,4) are 3,−3,1D.r’s of the line joining  (x,−2,4),(1,2,3) are (1−x,4,−1)The two lines are perpendicular  ⇒3(1−x)−12−1=0, ⇒x=−103