CUET and UG exam CUET UG 2025 Mock Test Series Mathematics Matrices

If A and B are square matrices of order 3, then 

1
adj (AB) = –adj A + adj B
2
(A + B)–1 = A–1 + B–1 
3
AB = O ⇒ |A| = 0 or |B| = 0 
4
AB = O ⇒ |A| = 0 and |B| = 0
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