[問題] 詢問二題統計問題,解法?
例)甲乙二人相距100km,甲以時速6km朝乙前進,乙以時速4km朝甲前進,
若甲帶著一隻狗,狗的時速10km,在甲乙間往返
(就是狗先從甲衝向乙,碰到乙再衝向甲)
請問當甲乙碰面時,狗跑了多少km?
例)將10支紅襪子、10支藍襪子放在箱子裡,在摸黑的環境下,
請問最少要抽出幾隻襪子才能確保其中有一雙顏色成對?
這兩題的解法!?拜託解答,謝謝
--
※ 發信站: 批踢踢實業坊(ptt.cc)
◆ From: 140.109.122.216
推
08/25 11:57, , 1F
08/25 11:57, 1F
→
08/25 12:00, , 2F
08/25 12:00, 2F
→
08/25 12:22, , 3F
08/25 12:22, 3F
推
08/25 13:41, , 4F
08/25 13:41, 4F
推
08/25 13:53, , 5F
08/25 13:53, 5F
→
08/25 20:22, , 6F
08/25 20:22, 6F
→
08/26 05:50, , 7F
08/26 05:50, 7F
→
08/27 04:38, , 8F
08/27 04:38, 8F
→
08/27 04:39, , 9F
08/27 04:39, 9F
→
08/27 04:41, , 10F
08/27 04:41, 10F
推
08/28 14:05, , 11F
08/28 14:05, 11F
→
08/28 14:06, , 12F
08/28 14:06, 12F
→
08/28 23:09, , 13F
08/28 23:09, 13F
→
08/29 01:07, , 14F
08/29 01:07, 14F
→
08/29 01:09, , 15F
08/29 01:09, 15F
推
09/09 18:34, , 16F
09/09 18:34, 16F