Question: Exercice 3 : (a) Dmontrer que : Lorsque r n etr m. Indication : On pourra considrer un groupe comprenant n hommes et m

Exercice 3 : (a) Dmontrer que : Lorsque r n etr m.

Exercice 3 : (a) Dmontrer que : Lorsque r n etr m. Indication : On pourra considrer un groupe comprenant n hommes et m femmes, puis dterminer le nombre de sous-groupes de r personnes qu 'on peut former. (b) En dduire que (k) (c) Montrer que (k) (1)k = O et en dduire que

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