The vectors 2î+ 3ĵ− 2k̂, 5î+ aĵ+ k̂ and −î+ 2ĵ+ 3k̂ are coplanar when 𝑎 is

Question: The vectors 2î+ 3ĵ− 2k̂, 5î+ aĵ+ k̂ and −î+ 2ĵ+ 3k̂ are coplanar when 𝑎 is

(A) −9

(B) 9

(C) −18

(D) 18

Answer: option (D)

Solution:

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