Let for a triangle ABC, AB =-2 i + j +3 k , CB = i + j + k and CA =4 i +3 j + k . If 0 and the area of the...

Question

Let for a triangle ABC, AB =-2 i + j +3 k , CB = i + j + k and CA =4 i +3 j + k . If > 0 and the area of the triangle ABC is 5 6, then CB . CA is equal to :

Accepted Answer

(A)

JEE Main 2023 Mathematics question

Solution