九个数字选三个有多少组合怎么算

简介：The woman, with her hair tied high in a fairy bun, slowly walked out from behind the stage. Two strands of hair on the temples drifted to her lips in the wind, her brows were as clear and light as the moon in the clouds, and her skin was as cold and white as frost on flowers. His eyes were bright, and in a blink of an eye, there seemed to be skylight shining on his head at all times.