If 2 {\A}=(\table 2 , 1 ; 3 , 2), then what is {\A}^{-1} equal to?

Correct Answer is : 12(2−1−32)

\frac{1}{2}(\table 2 , -1 ; -3 , 2)

\frac{1}{4}(\table 2 , -1 ; -3 , 2)

UPSC NDA II 2013 Mathematics Paper

Question : 114 of 120

Marks: +1, -0

If 2A=(

2	1
3	2

), then what is A−1 equal to?

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2	−1
−3	2

2	−1
−3	2

2	−1
−3	2