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

臉譜網(wǎng)：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(tuán)：你玩乒乓球的戰(zhàn)術(shù)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(shè)想一下你現(xiàn)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？