HMMT 二月 2000 · POW 赛 · 第 12 题
HMMT February 2000 — POW Round — Problem 12
题目详情
- Find the o eÆ ien t of X Y in ea h of the follo wing. 7 (a) ( X + Y + 1 ) 7 2 (b) ( X + Y 1 )
解析
- This is v ery similiar to 11. A) = 210 B) 7! = (3!3!) = -140 2!3!2!
HMMT February 2000 — POW Round — Problem 12