个人IPS经典题R23第6题中的statement3,前半段[拥有10年certain period option income yield越低]我理解没有问题,但是后半段[but it would be reduced by greater amounts the longer shewaits to purchase the annuity],我理解等待期越长等价于越晚购买年金,相应的N会比较小,yield会更高,所以这里的[by greater]应该是[by smaller]才对吧?那这个statement不就是错误的了吗?