3 and 4 .Determinants and Matrices
easy

बिना प्रसरण किए और सारणिकों के गुणधर्मो का प्रयोग करके सिद्ध कीजिए।

$\left|\begin{array}{lll}2 & 7 & 65 \\ 3 & 8 & 75 \\ 5 & 9 & 86\end{array}\right|=0$

Option A
Option B
Option C
Option D

Solution

$\left|\begin{array}{lll}2 & 7 & 65 \\ 3 & 8 & 75 \\ 5 & 9 & 86\end{array}\right|=\left|\begin{array}{lll}2 & 7 & 63+2 \\ 3 & 8 & 72+3 \\ 5 & 9 & 81+5\end{array}\right|$

$=\left|\begin{array}{lll}2 & 7 & 63 \\ 3 & 8 & 72 \\ 5 & 9 & 81\end{array}\right|+\left|\begin{array}{lll}2 & 7 & 2 \\ 3 & 8 & 3 \\ 5 & 9 & 5\end{array}\right|$

$=\left|\begin{array}{lll}2 & 7 & 9(7) \\ 3 & 8 & 9(8) \\ 5 & 9 & 9(9)\end{array}\right|+0$        [ Two Coloumms are identical]

$=9\left|\begin{array}{lll}2 & 7 & 7 \\ 3 & 8 & 8 \\ 5 & 9 & 9\end{array}\right|$

$=0$         [ Two Coloumns are identical]

Standard 12
Mathematics

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