If the lines x -1/-3=y 2/2k =z 3/2 and x 1/3k=y- 5/1=z-6/-5 are at rightangles, then the value of kis o (a)-710 o (b)-107 o (c)-10 o (d)-7

Options are incorrect as ans should be -10/7 as m1n1 +m2n2+m3n3=0

answer

Dear vijay, i think options are not correct. As the correct answer would be –10/7 . but none of them are seems to be compatible with the answer.