A guy says to his friend,"Guess how many coins I have in my pocket."The friend says,"If I guess right,will you give me one of them?"The first guy says,"If you guess right,I'll give you both of them."Ŷ�����������лл������Ȼ���Ͳ��࣬���Ѿ����ҵ�ȫ���ˡ��Ҿ����ģ�ͼ�����档