bonsoir, pourriez vous m'aidez svp je n'y arrive vraiment pas j'essaye depuis plus d'une heure merci d'avance.

bonjour,
R revers
D :droit
quelles sont les issues possibles

                 1ere balle            2 eme balle    3  émé balle
                                                                             R                RRR
                                                    R
                                                                              D               RRD
                       R
                                                                               R              RDR
                                                    D
                                                                                D            RDD

                                                                                R             DRR
                                                     R
                                                                                D              DRD
                                D
                                                                               R               DDR
                                                     D
                                                                                D              DDD

Il y a 8 issues possibles

3 coups du même côtés
RRR
et
DDD
2 possibilités sur 8
P(3 m^me côté)=2/8=0.25