What is the determinant of the 2x2 matrix with rows [2 3] and [1 4]?
A
5
B
8
C
11
D
14
Correct Answer: Option A — 5
Explanation:
Det = ad-bc = (2×4)-(3×1) = 8-3 = 5. Determinants are used to solve linear systems find matrix inverses and identify singular matrices. A matrix with zero determinant is singular and uninvertible. Matrix algebra including determinants inverses and systems of equations is tested in CSS PMS and higher competitive exams.