3589这个数，数位从左到右递增，也就是说，9比8大比5大比3大。接下来您应该懂了。
也就是求组合，就是求有多少种组合，从10个数字中选3个数字，且3个数字不同（因为第一位只可能是3，所以是选3个数，不是选4个数；还因为选完了数会自动排，所以是组合。）
答案 10C3
2. 排列。5个字母排列，所以是 1/...
In the integer 3589 the digits are all different and increas
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