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[" Q.72If "(m+n)P(2)=56" and "m-nP(2)=12...

[" Q.72If "(m+n)P_(2)=56" and "m-nP_(2)=12" then "(m,n)],[" equals- "],[[" (A) "(5,1)," (B) "(6,2)(C)(7,3)," (D) "(9,6)]]

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