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= 3{ 4(6) - 5(0)} - 0{2(6)- 1(0)} + 0 {2(5) -1(4)}
= 3(24-0) - 0(12-0) + 0(10-4)
= 72
itu artinya determinan, nah jadi kita nyari determinan!
langsung ke penyelesaiian
dikarenakan ordo 3x3 jadi kita harus menambahkan 2 baris di kanan jadi
\left[\begin{array}{ccc}3&2&1\\0&4&5\\0&0&6\end{array}\right] \left\begin{array}{ccc}&2&1\\&4&5\\&0&6\end{array}\right
dikalikan ((3x4x6)+(2x5x0)+(1+0+0))-((2x0x6)+(3x5x0)+(1x4x0)
(72+0+0)-(0+0+0)
jadi hasilnya 72
jawabannya opsi E.