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Question Number 123965 by Khalmohmmad last updated on 29/Nov/20

$$A=\left[\begin{array}{c}123\\ 231\\ 321\end{array}\right]$$$$det\left(M_{3\times 3}\right)=?$$

Commented by MJS_new last updated on 29/Nov/20

$$\left|\begin{array}{ccc}a& b& c\\ d& e& f\\ g& h& i\end{array}\right|=aei+bfg+cdh-(afh+bdi+ceg)$$

Commented by JDamian last updated on 29/Nov/20

What is M?

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