BPSC 53-55th Exam Prelims 17 Apr 2011 Solved Paper

Question : 74 of 150

Marks: +1, -0

The inverse of the matrix

[\table 5 , 2 ; 7 , 3]

Solution:

From the question. matrix

{\A}=[\table 5 , 2 ; 7 , 3]

\Adj A=[\table 3 , -2 ; -7 , -5]

| {A}|=|-15+14|=1

{\A}^{-1}=\;{\Adj( {A})}/{| {\A}|}=[\table 3 , -2 ; -7 , 5]

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