10个数字选3个有多少种组合

Wang Chengen quietly changed a cup of hot tea for Emperor Chongzhen. It has been more than ten years. He has long been accustomed to His Majesty the Emperor reviewing memorials until late at night. Apart from doing so quietly and not disturbing His Majesty the Emperor, all he has to do is to serve the Emperor. His Majesty the Emperor frequently exchanged hot tea, and when he looked at His Majesty the Emperor, in addition to awe, there was also a lot of reluctance.

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