2017年9月22日 · See below. The general formula for combinations is: (n!)/(r!( n - r)! Where n is the number of objects and r is how many are taken at a time. n! means n x (n - 1) x ( n - 2 ).....( …

2017年10月27日 · #"Formular" rArr ^nC_r = (n!)/((n - r)! r!)# Where.... #c = 9, r = 3# #rArr ^9C_3 = (9!)/((9 - 3)!3!)# #color(white)(xxxx) rArr (9!)/((9 - 3)!3!)#

2016年8月16日 · In how many ways can the season end with 8 wins, 4 losses, and 2 tie is a college football team

2017年6月2日 · In general, if you have #m# items of one type and #n# things of another type, how many possible