If the product PQ has inverse 
then \[{{Q}^{-1}}\] equals
A)
B)
C)
D) None of these
Correct Answer: B
Solution :
[b] \[{{(PQ)}^{-1}}=R\] \[\Rightarrow \,\,\,\,{{Q}^{-1}}.{{P}^{-1}}=R\]
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