**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 (F)

**Solution :**

with
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**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 (F)

**Solution :**