3 and 4 .Determinants and Matrices
medium

यदि $\Delta  = \left| {\,\begin{array}{*{20}{c}}a&{a + b}&{a + b + c}\\{3a}&{4a + 3b}&{5a + 4b + 3c}\\{6a}&{9a + 6b}&{11a + 9b + 6c}\end{array}\,} \right|$ जहाँ $a = i,b = \omega ,c = {\omega ^2}$, तब $\Delta $का मान होगा

A

$i$

B

$ - {\omega ^2}$

C

$\omega $

D

$ - i$

Solution

दी गई सारणिक में संक्रियाओं ${R_3} \to {R_3} – 2{R_2}$ और ${R_2} \to {R_2} – 3{R_1}$ से,

$a[{a^2} + ab – 2{a^2} – ab] =  – {a^3} = i$.

Standard 12
Mathematics

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