https://www.youtube.com/watch?v=eYmSDnVFxT4

https://cdn.nlark.com/yuque/0/2022/png/576791/1655549778304-2d181bb2-0b0d-41ed-90fe-66661034c973.png#clientId=u411959d0-dbe8-4&from=paste&height=593&id=u4a2fae62&originHeight=1186&originWidth=2326&originalType=binary&ratio=1&rotation=0&showTitle=false&size=1985993&status=done&style=none&taskId=u71ad34fa-dcc0-484e-bee9-e86a982dd6b&title=&width=1163

https://cdn.nlark.com/yuque/0/2022/png/576791/1655549802551-f9dfd118-e476-437e-bb15-db9ce7397f9f.png#clientId=u411959d0-dbe8-4&from=paste&height=587&id=uc305a61e&originHeight=1174&originWidth=2320&originalType=binary&ratio=1&rotation=0&showTitle=false&size=1981160&status=done&style=none&taskId=ua8915ef9-be06-4805-ae0b-cce4c127be8&title=&width=1160

這個問題很簡單解釋 用先選到羊再改變會得車 先選車再改變會得羊 也就是說一開始選到羊 改了就能拿到車 那羊一開始被選中的機率是三分之二 所以要改