Math Olympiad (Primary Schools) 一筐鸡蛋 August 3, 2017ChefCouscous IMO, Uncategorized 1 Comment One basket of eggs. 1粒1粒拿,正好拿完。 Remove 1 by 1, nothing left in basket. 2粒2粒拿,还剩1粒。 Remove 2 by 2, one left in basket. 3粒3粒拿,正好拿完。 Remove 3 by 3, nothing...