jim and marry (名字忘了,乱起的)are the 2 newest member of a group. The group has 10 members. choose 2 people from the group, what is the possibility that the 2 members are jim and marry? 答案: 45
jim and marry (名字忘了,乱起的)are the 2 newest member of a group. The group has 10 members. choose 2 people from the group, what is the possibility that the 2 members are jim and marry? 答案: 45