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[" 10.If "m+nP(2)=90" and "m-nP(2)=30" ,...

[" 10.If "m+nP_(2)=90" and "m-nP_(2)=30" ,find "m" and "n" ."],[" 11.If "56P_(r)+6:5^(@)P_(r+3)=30800:" I,find "r" ."]

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If ^56 P_(r+6):^(54)P_(r+3)=30800 :1, find r

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