Find the value of λ so that the following vectors are coplanar.

Formula : -


andthen,




Given: -



we know that vector are coplanar if their scalar triple product is zero



we have



now, using



⇒ 0 = 1(0 + 5) – 3(0 – 5λ) + 0


⇒ 0 = 5 + 15λ



5