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3 and 4 .Determinants and Matrices
normal
$\left| {\,\begin{array}{*{20}{c}}{{a_1}}&{m{a_1}}&{{b_1}}\\{{a_2}}&{m{a_2}}&{{b_2}}\\{{a_3}}&{m{a_3}}&{{b_3}}\end{array}\,} \right| = $
A
$0$
B
$m{a_1}{a_2}{a_3}$
C
$m{a_1}{a_2}{b_3}$
D
$m{b_1}{a_2}{a_3}$
Solution
(a)$\left| {\,\begin{array}{*{20}{c}}{{a_1}}&{m{a_1}}&{{b_1}}\\{{a_2}}&{m{a_2}}&{{b_2}}\\{{a_3}}&{m{a_3}}&{{b_3}}\end{array}\,} \right| = m\,\left| {\,\begin{array}{*{20}{c}}{{a_1}}&{{a_1}}&{{b_1}}\\{{a_2}}&{{a_2}}&{{b_2}}\\{{a_3}}&{{a_3}}&{{b_3}}\end{array}\,} \right| = 0$, $\{ \therefore {C_1} \equiv {C_2}\} $.
Standard 12
Mathematics