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if A=[[1,2,1],[3,2,3],[2,1,2]] , then a1...

if `A=[[1,2,1],[3,2,3],[2,1,2]]` , then `a_11 A_11+a_21A_21+a_31A_31`=

A

1

B

2

C

|A|

D

3

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