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3 and 4 .Determinants and Matrices
normal
The value of the determinant$\left| {\,\begin{array}{*{20}{c}}{ - 1}&1&1\\1&{ - 1}&1\\1&1&{ - 1}\end{array}\,} \right|$is equal to
A
$-4$
B
$0$
C
$1$
D
$4$
Solution
(d)Apply ${R_1} \to {R_1} + {R_2}$ and then expand along ${R_1}$.
Standard 12
Mathematics