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Q.

Let A be a 3×3 matrix and A = 2. If n=det(adj(adj((adjA)2024 times ))) Then the remainder when n is divided by 9 is equal to_______.

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answer is 7.

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Detailed Solution

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|A| = 2
adj(adj(adj..(A)))2024 times =|A|(n1)2024=|A|2024=22024 
22024=(22)22022=4(8)674=4(91)674 
220244(mod9)220249 m+4, m even 
29 m+416·(23)3 m16(mod9)7 

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Let A be a 3×3 matrix and A = 2. If n=det(adj(adj(……(adjA)⏟2024− times ))) Then the remainder when n is divided by 9 is equal to_______.