### Question Asked by a Student from EXXAMM.com Team

Q 1287212187.     Direction cosines of a line satisfy the relation λ ( l + m ) = n , mn + nl + lm = 0. Value of λ , for which the two lines are perpendicular to each other is
A

-1

B

2

C

1//2

D

1

#### HINT

(Provided By a Student and Checked/Corrected by EXXAMM.com Team)

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