# algebra:PEMDAS

May 29th, 2015
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On the GMAT, you need to know the correct order of operations when simplifying an expression. The correct order of operations is: Parentheses-Exponents-(Multiplication/Division)-(Addition/Subtraction).

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Nama : Janna Sri BinaNIM : 408111067Calculate The Determinant of following matrix: Solution:First, we will try to find the permutation of matrix. And we will get like the table:Multiplication of elementary resultpermutationAmount of inverseClassificationResult of permutationa11 a22 a33 a44(1, 2, 3, 4)0Evena11 a22 a33 a44a11 a23 a32 a44(1, 3, 2, 4)1Odd-a11 a23 a32 a44a11 a24 a32 a43(1, 4, 2, 3)2Evena11 a24 a32 a43a11 a22 a34 a43(1, 2, 4, 3)1Odd-a11 a22 a34 a43a11 a23 a34 a42(1, 3, 4, 2)2Evena11 a23 a34 a42a11 a24 a33 a42(1, 4, 3, 2)3Odd- a11 a24

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