在数学的排列与组合中用 A 代表 Arrangement 表示“排列”(在旧教材为 P -> Permutation),用 C 代表 Combination 表示“组合”,所以如果你还记得排列与组合的计算公式的话,就一目了然了。
英文词源
combination (n.)
late 14c., combinacyoun, from Old French combination (14c., Modern French combinaison), from Late Latin combinationem (nominative combinatio) "a joining two by two," noun of action from past participle stem of combinare (see combine (v.)).
双语例句
1. You can cobble it together from any old combination of garments.
把以前的衣服随便搭配一下就能拼凑出一套。
来自柯林斯例句
2. They competed for power through a combination of parliamentary and extra-parliamentary methods.
他们在议会内外同时下手争夺权力。
来自柯林斯例句
3. The combination of sex and treachery proved a copper-bottomed circulation booster.
事实证明,性和背叛的话题结合起来无疑大大增加了发行量。
来自柯林斯例句
4. Their success is the result of a fortuitous combination of circumstances.
他们的成功是各种环境因素偶然联系在一起的幸运产物。
来自柯林斯例句
5. His treatment was a combination of surgery, radiation and drugs.