26 February 2018

• curprev 17:1717:17, 26 February 2018 Hapaxoromenon talk contribs m 2,045 bytes 0 Fixed a typo

16 November 2017

• curprev 15:0015:00, 16 November 2017 NeoMathematicalKid talk contribs 2,045 bytes +1,532 →Solution: Add one

23 October 2014

• curprev 00:5700:57, 23 October 2014 Timneh talk contribs 513 bytes +513 Created page with "==Problem== For any real number a and positive integer k, define <math>{a \choose k} = \frac{a(a-1)(a-2)\cdots(a-(k-1))}{k(k-1)(k-2)\cdots(2)(1)}</math> What is <math>{-\frac..."