Mathematics Matrices Adjoint and Inverse of a Square Matrix

If A and B are invertible matrices, then which of the following is not correct ?

1
adj A = |A|. A–1
2
det(A–1)= [det (A)]–1
3
(AB)–1 = B–1 A–1
4
(A + B)–1 = B–1 + A–1

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