A=[21−11] A2=[21−11][21−11]=[33−30]A3=[33−30][21−11]=[36−6−3]A4=[36−6−3][21−11]=[09−9−9]A5=[09−9−9][21−11]=[−99−9−18]A6=[−99−9−18][21−11]=[−2700−27]A7=[−270−0−27][−54−2727−27]=[36×2272−27236]37=3n⇒n=7
Let A=[21−11]. If the sum of the diagonal elements of A13 is 3n, then n is equal to_________
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