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if A=[(1,2,3),(2,1,-1),(a,2,b)] is a mat...

if `A=[(1,2,3),(2,1,-1),(a,2,b)]` is a matrix satisfying `A A'=9l_(3,)` find the value of `|a|+|b|.`

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The correct Answer is:
`a=-2, b=-11`
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