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If A=[(1,2,1),(3,2,3),(2,1,2)] , then a(...

If `A=[(1,2,1),(3,2,3),(2,1,2)]` , then `a_(11) A_(11)+a_(21) A_(21)+a_(31) A_(31)=`

A

1

B

2

C

|A|

D

3

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The correct Answer is:
C
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