Facebook: 25 racehorses, no stopwatch, five tracks. Figure out the top three fastest horses in the fewest number of races.

　　臉譜網：25匹賽馬;沒有秒表;5條跑道。通過多少場比賽(最少)才能計算出跑得最快的前三匹馬

　　Citigroup: What is your strategy at table tennis?

　　花旗集團：你玩乒乓球的戰術是什么?

　　Google: You are climbing a staircase. Each time you can either take one step or two. The staircase has n steps. In how many distinct ways can you climb the staircase?

　　谷歌：設想一下你現在在爬樓梯，每一次你可以一次性登上一級或者兩級臺階。樓梯的臺階有N個。請問，你有多少種直接方法可以爬到樓梯的最高處?

　　Gryphon Scientific: How many cocktail umbrellas are there in a given time in the United States?

　　Gryphon科技：全美的雞尾酒里面配有多少把小花雨傘呢?