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3 and 4 .Determinants and Matrices
medium
$\left| {\,\begin{array}{*{20}{c}}1&1&1\\1&{1 + x}&1\\1&1&{1 + y}\end{array}\,} \right| = $
A
$1$
B
$0$
C
$x$
D
$xy$
Solution
(d) $\left| {\,\begin{array}{*{20}{c}}1&1&1\\1&{1 + x}&1\\1&1&{1 + y}\end{array}\,} \right| = \left| {\,\begin{array}{*{20}{c}}0&0&1\\{ – x}&x&1\\0&{ – y}&{1 + y}\end{array}\,} \right| = xy,$
[${C_1} \to {C_1} – {C_2}$ ; ${C_2} \to {C_2} – {C_3}$]
Standard 12
Mathematics