# A= 3î− ĵ+ 7k̂ and B = 5î− ĵ+ 9k̂ the direction cosine m of the vector A⃗ + B is

Question :A= 3î− ĵ+ 7k̂ and B = 5î− ĵ+ 9k̂ the direction cosine m of the vector A+ B is

(A) zero

(B) $\dfrac{3}{\sqrt{31}}$

(C) $\dfrac{9}{\sqrt{107}}$

(D) 5