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CoraCena
@CoraCena
June 2021
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Bonjour, j'ai un DM a faire en mathématique ( première ) et je bloque sur un exercice. La question 1 je pense avoir trouver. Mais la question 2 je bloque d
onc si vous pouvez m'éclairer s'il vous plait. Merci d'avance.
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esefiha
2.a) formule : 2*D3 = 2*0.15
b) B3 = E3 - (C3+D3) = 0.7-(0.30+0.15) = 0.25
B4 = A2 + A3 = 0.05+0.25 = 0.30
C2 = C4-C3 = 0.45-0.30 = 0.15
D2 = E2 - (B2+C2) = 0.3-(0.05+0.15) = 0.10
E4 = E3+E4 = 0.3+0.7 = 1
D4 = D2+D3 = 0.10+0.15 = 0.25
ou D4 = E4 - (B4+C4) = 1-(0.30+0.45) = 0.25
3. a)
p(A n T) = 0.25
p(B n F) si on est logique B : "le menu est un menu B" donc
p(B n F) = 0.30
p(A n F) = 0.15
b) p(A U F) = p(A n T) + p(F) = 0.05+0.7 = 0.75
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Thanks 1
CoraCena
Merci beaucoup, je vais essayer de comprendre!
esefiha
De rien
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b) B3 = E3 - (C3+D3) = 0.7-(0.30+0.15) = 0.25
B4 = A2 + A3 = 0.05+0.25 = 0.30
C2 = C4-C3 = 0.45-0.30 = 0.15
D2 = E2 - (B2+C2) = 0.3-(0.05+0.15) = 0.10
E4 = E3+E4 = 0.3+0.7 = 1
D4 = D2+D3 = 0.10+0.15 = 0.25
ou D4 = E4 - (B4+C4) = 1-(0.30+0.45) = 0.25
3. a)
p(A n T) = 0.25
p(B n F) si on est logique B : "le menu est un menu B" donc
p(B n F) = 0.30
p(A n F) = 0.15
b) p(A U F) = p(A n T) + p(F) = 0.05+0.7 = 0.75