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Without expanding at any stage, find the value of the determinant:
Without expanding at any stage, find the value of the determinant:
$\Delta = \begin{vmatrix} 2 & x & y+z \\ 2 & y & z+x \\ 2 & z & x+y \end{vmatrix}$
Answer
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From ISC 2018 Specimen Mathematics Paper 1, question 1(ii).