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Introduction aux Probabilités - Université Rennes 2

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1.5. Corrigés 33<br />

et on peut donc utiliser la formule de Poincaré pour calculer #A :<br />

n<br />

#A = (−1) k−1<br />

⎛<br />

⎝ <br />

⎞<br />

n<br />

#(Ai1 ∩···∩Aik ) ⎠ = (−1)<br />

k=1<br />

1≤i1

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