Answer in one word : \[ \left|\begin{array}{rrr} 3 & 1 & 9 \\ 5 & 2...

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Answer in one word :
\[
\left|\begin{array}{rrr}
3 & 1 & 9 \\
5 & 2 & 15 \\
7 & 4 & 21
\end{array}\right|
\]
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