If A and B are invertible square matrices of the same order, then which of the following is not correct?
 (a) adj A = |A|. A –1 (b) det (A) –1 = [det (A)]–1  
 (c) (AB) –1 = B –1A –1 (d) (A + B) –1 = B –1 + A –1 
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