如题所述
是0到9十个数,是我的错。对不起。
用组合公式计算
http://wapbaike.baidu.com/view/2104972.htm?fr=aladdin&ref=wise&ssid=0&from=1099a&uid=0&pu=sz%401320_480%2Ccuid%40C3C450F727FA1ECEF22FC67FD60D699DADB96C483ORQQGFEBED%2Ccua%401125_2001_iphone_6.5.0.0_0%2Ccut%40iPhone7%252C1_8.1.3%2Cosname%40baiduboxapp%2Cctv%401%2Ccfrom%401099a%2Ccsrc%40app_box_txt%2Cta%40zbios_1_8.1_6_0.0%2Cusm%400&bd_page_type=1&baiduid=291D46D1B3E1501540C1EC2E059DBFF4&tj=Xv_1_0_10_l1
百度查找组合公式即可