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Lamiettez
@Lamiettez
May 2019
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Bonsoir :) Voilà j'ai ce DM à faire et je suis bloquée à la question 2.b)
Quelqu'un pourrait-il m'aider ? (je suis en TS)
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scoladan
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Bonjour,
2)b)
Au moins une noire = 1 ou 2 ou ... ou 10 noires = jamais "que des rouges" = 1 - "que des rouges"
Proba de tirer 10 fois une rouge = (4/(n+4))^10
==> qn = 1 - (4/(n+4))^10
lim qn quand n-->infini = 1
1 - (4/(n+4))^10 > 0,9999
<=> (4/(n+4))^10 < 0,0001
<=> 4/(n+4) < 0,0001^(1/10)
<=> 4 < (n+4).0,0001^(1/10)
<=> n+4 > 4/[0,0001^(1/10)]
<=> n > 4/[0,0001^(1/10)] - 4
==> n > 10,047 - 4
==> n > 6 ==> n = 7
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Verified answer
Bonjour,2)b)
Au moins une noire = 1 ou 2 ou ... ou 10 noires = jamais "que des rouges" = 1 - "que des rouges"
Proba de tirer 10 fois une rouge = (4/(n+4))^10
==> qn = 1 - (4/(n+4))^10
lim qn quand n-->infini = 1
1 - (4/(n+4))^10 > 0,9999
<=> (4/(n+4))^10 < 0,0001
<=> 4/(n+4) < 0,0001^(1/10)
<=> 4 < (n+4).0,0001^(1/10)
<=> n+4 > 4/[0,0001^(1/10)]
<=> n > 4/[0,0001^(1/10)] - 4
==> n > 10,047 - 4
==> n > 6 ==> n = 7