(C5选1 * C4选1 * C4选1 * C4选1 * C(49-4)选3) / C49选7= 5 * 4 * 4 * 4 * ((45*44*43)/(1*2*3)) / C49选7用Excel公式计算就是：=COMBIN(5,1)*COMBIN(4,1)*COMBIN(4,1)*COMBIN(4,1)*COMBIN(45,3)/COMBIN(49,7) 本答案由巴蜀兄弟连“过桥mm”提供！
