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Sarrus Rule for Expansion

Sarrus gave a rule for a determinant of order 3.
 
Rule The three diagonals sloping down to the right give the three positive terms and the three diagonals sloping down to the left the three negative terms.
 
 
65049.png = a1 b2c3 + b1c2a3 + c1a2b3a3b2c1 b3c2a1c3a2b1




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