Question

Suppose the vectors x₁, x₂ and x₃ are the solutions of the system of linear equations, Ax = b when the vector b on the right side is equal to b₁, b₂ and b₃ respectively. If 

x = [1,1,1], x₂ = [0,2,1], x₃ = [0,0,1], b₁ = [1,0,0]

b₂ = [0,2,0] and b₃ = [0,0,2], then the determinant of 

A is equal to :- 

(1) 1/2

(2) 4 

(3) 3/2 

(4) 2

Answer 1

Answer is (4) 2