Question

If A = `[("a", "b"),("c", "d")]` then find the value of |A|⁻¹.

Answer 1

|A| = `|("a", "b"),("c", "d")|`

= ad – bc

∴ |A|⁻¹ = `1/("ad" - "bc")`     ...`[∵ |"A"^-1| = 1/|"A"|]`