Let \(A=\left[\begin{array}{ccc}1 & 0 & 0 \\ 0 & 1 & 22 \\ 0 & 1 / 7 & \pi\end{array}\right]\), then det(A) is

1
zero
2
a non-zero rational number
3
an irrational number less than 1
4
an irrational number greater than 1
5
one 

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