bonjour
on a 16 boules en tout
tirage sans remise
au premier tirage au second tirage
P (V) = 6/16 P (V) = 5/15
P (B)= 5 /15
P (R) = 5/15
P (B) = 5/16 P (V) = 6 /15
P ( B) = 4 /15
P ( R) = 5 /15
P ( R ) = 5 /16 P (V) = 6 /15
P ( B) = 5/15
P ( R) = 4/15
Proba de tirer une V au second tirage
= 6/16 x 5/15 + 5/16 x 6/15 + 5/16 x 6 /15
= 30/240 + 30 /240 + 30 /240
= 90/240 = 3/8
