Q2 of 26 Page 1

Find λ, if the vectors and are coplanar.

Three vectors are said to be coplanar if their scalar triple product is 0


As, are coplanar.


∴ …(1)



Expand the determinant along the first row.



∴


∴ from equation 1,we get-



⇒


∴ λ = 21/3 = 7


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