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[" 4.If matrix "A=[[a,b],[c,d]]" rthen "...

[" 4.If matrix "A=[[a,b],[c,d]]" rthen "|A|^(-1)" is equal to "],[" a."ad-bc],[" b."(1)/(ad-bc)],[[" c."(1)/(ad-bc)[-c,a]]],[" d.None of the above "]

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