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  • 枫下沙龙 / 谈天说地 / 有兴趣的请帮忙做一数学题：抽屉里有5种不同颜色的袜子，至少取多少只才能保证有6双？ -yj888(无非); 2001-7-14 (#131773@0)
    • 17 -laoyou(老油); 2001-7-14 (#131775@0)
      • but the answer is 16,i don't know how to get it. How can you work it out to be 17? pls tell me the clue. -yj888(无非); 2001-7-14 (#131796@0)
        • Right. 16. I though it's 6 different colors. If it's 6, then 17. But it's 5 different colors then should be 16. 6*2 = 12 + other 4 different colors =16. -laoyou(老油); 2001-7-14 (#131811@0)
          • hi laoyou. got my message? -holly(只羡厨师不羡仙); 2001-7-14 (#131812@0)
            • Yes, Thanks! I replied already, not got yet? But I didn't see the post you mentioned on the Email. -laoyou(老油); 2001-7-14 (#131821@0)
    • 21. -michaelchu(Acrobat); 2001-7-14 (#131789@0)
      • No. 16 -michaelchu(Acrobat); 2001-7-14 (#131791@0)
    • 56 -flying_snow(飞雪浮冰); 2001-7-14 (#131794@0)
      • 哦，题目看错了，答案应该是16.如果问同一种颜色的袜子6双至少要多少的话，则应该是56 -flying_snow(飞雪浮冰); 2001-7-14 (#131797@0)
    • 17,这是一道GMAT 题 -binzhou98(老虎); 2001-7-14 (#131798@0)
      • no,16 -binzhou98(老虎); 2001-7-14 (#131801@0)
        • binzhou有老虎吗？动物园跑出来的？ -000(老九); 2001-7-14 (#131802@0)
          • u are mistaken. 是一只叫binzhou的老虎 -binzhou98(老虎); 2001-7-14 (#131804@0)
            • 看名字象从binzhou的酒吧里跑出来的老虎 -000(老九); 2001-7-14 (#131807@0)
        • 五只五只取，最差的情况每次都是五种颜色，再取一只即满足六对 -binzhou98(老虎); 2001-7-14 (#131803@0)
          • 不对，照你这取法，只取11只，是怎么也不可能取到6双的，应该是取16只 -guest:; 2001-7-14 (#131860@0)
            • 假想每次取五只，取三次！ -binzhou98(老虎); 2001-7-14 (#132390@0)
    • 16 -000(老九); 2001-7-14 (#131799@0)
    • 打开台灯，拉开抽屉，找出6双，共12只。 -pingle(pingle); 2001-7-14 (#131834@0)
    • 像这种问题是数论中的抽屉原理。具体到这题来说，取6只，至少能配成一对。到配成5对时，你共有的袜数是：5对=10只，每种颜色各一只=5只，然后再取一只，无论如何都会有6对了，就是answer。 -michaelchu(Acrobat); 2001-7-14 (#132398@0)
      • 要保证有五对，应拿14只。 -binzhou98(老虎); 2001-7-14 (#132406@0)
        • 没错呀！5对14只，6对16只，7对18只呀！！ -michaelchu(Acrobat); 2001-7-14 (#132410@0)
          • 应该是16只.最差情况取5只不重色,第6只配一双.但是在最差情况下第7只可能和陪对的袜子是一种颜色,所以要取第8只才能配成两双.以此类推,陪6双要16只. -guest:; 2001-7-16 (#133434@0)
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