MathematicsMedium249×since 2002Q2476The lines x−21=y−31=z−4−k{{x - 2} \over 1} = {{y - 3} \over 1} = {{z - 4} \over { - k}}1x−2=1y−3=−kz−4 and x−1k=y−42=z−51{{x - 1} \over k} = {{y - 4} \over 2} = {{z - 5} \over 1}kx−1=2y−4=1z−5 are coplanar if :Ak=3k=3k=3 or −2-2−2Bk=0k=0k=0 or −1-1−1Ck=1k=1k=1 or −1-1−1Dk=0k=0k=0 or −3-3−3Check answerSkip