Question

Choose the correct alternative:

If A B, and C are invertible matrices of some order, then which one of the following is not true?

Options

• adj A = |A|A^–1

• adj(AB) = (adj A)(adj B)

• det A^–1 = (det A)^–1

• (ABC)^–1 = C^–1B^–1A^–1

Answer 1

adj(AB) = (adj A)(adj B)