3 and 4 .Determinants and Matrices
easy

यदि ${\Delta _1} = \left| {\,\begin{array}{*{20}{c}}1&0\\a&b\end{array}\,} \right|$ और  ${\Delta _2} = \left| {\,\begin{array}{*{20}{c}}1&0\\c&d\end{array}\,} \right|$, तो ${\Delta _2}{\Delta _1}$=

A

$ac$

B

$bd$

C

$(b - a)(d - c)$

D

इनमें से कोई नहीं

Solution

(b)${\Delta _2}{\Delta _1} = \left| {\begin{array}{*{20}{c}}1&0\\c&d\end{array}} \right|\,\,\left| {\,\begin{array}{*{20}{c}}1&0\\a&b\end{array}\,} \right| = \left| {\,\begin{array}{*{20}{c}}1&0\\{c + ad}&{bd}\end{array}\,} \right| = bd$.

Standard 12
Mathematics

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