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[" 3.If "10^(2y)=25" ,then "10^(-y)" equ...

[" 3.If "10^(2y)=25" ,then "10^(-y)" equals "],[[" (a) "-(1)/(5)," (b) "(1)/(50)," (c) "(1)/(625)," (d) "(1)/(5)]]

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