How many even three-digit integers have the property that their digits,read left to right,are strictly increasing order?
这道题老师讲过了，但是孩子笔记没有记下来，又忘记但是老师是怎样讲的了。我们研究半天觉得答案应该是35,可孩子说是34。到底这道题该怎样解呢？请老师或家长指点。谢谢！