难道不是9％？有政策规定只要一个抽中 另外一个就一定能进吗？还是你猜的

我选b51% 1-0.7*0.7=0.51

就像摸奖似的别人只让摸一次， 你可以摸两次，当然概率大哈。

比30%低一些双胞胎的确是要进一起进 但是两个加起来只有一个抽签机会 而且如果只剩最后一个名额的话 双胞胎不能抽 假设现在100个学生抽30个名额 别人抽30次 双胞胎只抽29次 早些年现场抽签的时候如果有双胞胎会对所有参加的家长解释规则 我相信现在电脑抽应该也是一样

比30%低一些双胞胎的确是要进一起进 但是两个加起来只有一个抽签机会 而且如果只剩最后一个名额的话 双胞胎不能抽 假设现在100个学生抽30个名额 别人抽30次 双胞胎只抽29次 早些年现场抽签的时候如果有双胞胎会对所有参加的家长解释规则 我相信现在电脑抽应该也是一样

这个回答比较靠谱搜到两个佐证，MOE是说treated as one application，Strait times则明确说allotted one number。 MOE: Question: Will my children who are registering at the same school all be admitted if one of them is successful in a ballot? Answer: Siblings, twins or triplets of the same citizenship will be treated as one application for the purpose of balloting. This means that all children will be admitted to the school if one of them is successful in getting a place after the computerised balloting. Strait times: Q: I am registering my twins for Primary 1 this year. If there is balloting, what happens if one gets in and the other does not? Or will they be balloted together? A: Yes, if there is balloting, your twins will be allotted one number. If it is picked, both your children will be admitted to the school.

Kiasu上的一个帖子2011年的，不知道准确性如何。 Yes for twins/triplets, they can choose to either ballot individually (means each child gets 2 slips) or collectively (means 2 slips for each set of twins/triplets). For the former, only the child that gets picked will get a place and the twin that doesn't get picked will have to go to another school. For the latter, the whole set of twins/triplets will go through. So you see, it is a calculated risk on the part of the parents, they get fewer slips but if they win, they really win big! If these twins/triplets were to be picked last then the school will have to create more places for them but since they weren't, they took up 7 out of the seats alloted for P2C. Like in St Nick's Girls at P2B, the twins were picked last and the school had to take an extra seat from P2C to give it to them at P2B.

和一般人没啥分别具体规则是：家长可以选择两个人分开或者一起。如果选择分开，两个人就和没关系一样，各自抽签。出现一个进，一个没进的情况就自己啃了。如果选择一起，两个人只有一个签，要不一起进，要不一起不进。如果这个签在最后一个位置之前抽到，则一次占用两个位置。如果刚好最后一个抽到，学校就收多一个学生。概率怎么会有大分别呢？

综合起来看选C跟其他人几率一样，哈哈

仔细算有细微差别假设50人抽15个，有一对双胞胎，选择一起，那么只有49个签，他们抽不到的几率是48/49*47/48*...*34/35＝34/49。其他人抽不到的几率＝33/48*34/49＋34/48*1/49＋35/48*14/49＝34.29/49。 所以双胞胎抽到几率略高。我好空

仔细算有细微差别假设50人抽15个，有一对双胞胎，选择一起，那么只有49个签，他们抽不到的几率是48/49*47/48*...*34/35＝34/49。其他人抽不到的几率＝33/48*34/49＋34/48*1/49＋35/48*14/49＝34.29/49。 所以双胞胎抽到几率略高。我好空