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Question Number 147603 by puissant last updated on 22/Jul/21
Answered by Olaf_Thorendsen last updated on 22/Jul/21
SoitGlenombredegarcons.SoitFlenombredefilles.G+F=10(1)ChaquegarconaG−1freresFsoeursetchaquegarconadeuxfoisplusdesoeursquedefreres.DoncF=2(G−1)=2G−2(2)Eninjectant(2)dans(1),ona:G+F=G+2G−2=103G=12⇒G=4etdoncF=6Ilya6fillesdoncchaquefillea5soeurs.
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