If \( \mathrm{A} \) and \( \mathrm{B} \) are non-singular matrices ...

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If \( \mathrm{A} \) and \( \mathrm{B} \) are non-singular matrices of same order,
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then what is \( (A B)^{-1} \) is equal to
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(1) \( A^{-1} B^{-1} \)
(2) \( B^{-1} A^{-1} \)
(3) \( A^{-1}+B^{-1} \)
(4) None of these
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