The National Capital Region (NCR) encompasses Washington, DC; Montgomery and Prince George's Counties in Maryland; Arlington, Fairfax, Loudoun, and Prince William Counties in Virginia; and the incorporated cities of Alexandria, Falls Church, Fairfax, and Manassas in Virginia. The NCR is about 2,500 square miles (6,475 sq km).

NCR Voyix is a leading global provider of digital commerce solutions for retailers and restaurants. NCR Atleos is a leader in expanding financial access by shifting transactions to the self-service channel and enabling financial institutions and retailers to leverage its ATM network.

“nCr”单独设为一个按键的科学计算器一般见于卡西欧的W系列、TL系列、MS系列的入门级型号，使用时一般是先输入元素总数n，然后通过 [nCr]键输入符号“ C ”，再输入取出组合的元素个数r，按 [=]即可计算。

NCR Voyix Corporation, previously known as NCR Corporation and National Cash Register, is a global software, consulting and technology company providing several professional services and electronic products. It manufactured self-service kiosks, point-of-sale terminals, automated teller machines, check processing systems, and barcode scanners.

nCr formula is also known as the "combinations formula". nCr formula is used to find the number of ways of choosing r objects from n objects where the order is not important.

2024年8月13日 · What is nCr Formula? nCr represents "n choose r," a concept in combinatorics that calculates the number of ways to select a group of items from a larger set without considering the order of selection. It is denoted mathematically as: nCr = n! / (r! (n - r)!) Where, "n" is the total number of items in the set, "r" is the number of items to be ...

NCR公司 （NCR Corporation，原稱：National Cash Register）是一家總部位於美國 喬治亞州 亞特蘭大 的 計算機硬件 、 軟件 和 電子產品 公司，主要生產 銷售點終端 、 自動櫃員機 、 條碼閱讀器 等，此外也提供IT維修服務。

2025年3月11日 · The article explains how to calculate combinations (nCr) using various methods, including factorials, recursion, and logarithmic formulas, along with their respective time complexities and implementations in multiple programming languages.

NPR and NCR are the mathematical notation of two important concepts in mathematics, referred to as permutations and combinations. Both these concepts are similar in terms of what they mean to achieve, yet they are also different on a number of grounds.

NCR公司（纽约证券交易所股票代码为NCR）是全球关系管理技术 (RelationshipTechnology™) 解决方案 领导供应商，为全球零售、金融、传讯、制造、旅游、交通及保安等客户提供服务。