数学113排列组合两条原则
Synopsis
GMAT数学不是背公式，而是要知其所以然。知识点之间应紧密相连而非隔离。集合、概率、数列是一脉相承的，跟着毕出老师学， ...
![[排列組合][證明]](https://i.ytimg.com/vi/ESU6yim8Fas/hq720.jpg?sqp=-oaymwE2CNAFEJQDSFXyq4qpAygIARUAAIhCGAFwAcABBvABAfgB_gmAAtAFigIMCAAQARhlIFAoRjAP&rs=AOn4CLDvt3hJBpzDkRyo_xMty2OHtCRAag)
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