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Mencari determinannya dengan cara sarrus:
=>
det. Matriks = {(1*5*9)+(2*6*7)+(3*4*8)}-{(7*5*3)+(8*6*1)+(9*4*2)}
det. Matriks = (45 + 84 + 96) - (105 + 48 + 72) = 120 - 120 = 0