TD N - Université Djillali Liabes

2´eme
Charg de cours Mr Difi S
Ak
n1An−k n2Ck n=n!Ck n1Cn−k n2
Cp
nCm p=Cm nCn−p
n−m
Ck
n1Cn−k n2
Cn
n1+n2
=Ck
nCn1−k
n1+n2−n
Cn1
n1+n2
n k 1≤k < n
•Ck−1
n−1+Ck
n−1=Ck n
•Ck−2
n−2+ 2Ck−1 n−2+Ck
n−2=Ck n
PΩA B
P(A)=1/3, P (B)=2/5, P (AT¯ B) = 1/6
P(ATB), P (ASB), P (BT¯ A), P (AT¯ B)
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ATB, B TC, A SB, A SC.
30cm
1
10,20 30cm 20,10 5
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