JEE Main 2019 Mathematics question

Mathematics Matrices JEE Main 2019

Let . If , then |p| is:

(A)Correct
(B)
(C)
(D)

Answer: (A)

Solution

Rows 2 and 3 orthogonal: ; row 2 unit: . (The first row is cut in the source; the official matrix is used.)

Question ID VK-010548