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作者 keith291 在 PTT [ Math ] 看板的留言(推文), 共662則
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3F→: google "positive definite"05/18 00:47
1F→: google 生成函數05/17 13:24
6F→: sin(nx)/x 並沒有恆正05/16 22:26
13F→: sin(nx) 在第3象限並不是正的05/16 23:56
14F→: 另外積分微分可交換性亦未驗證, 不一定成立05/17 00:02
4F→: 不是吧, 設每場勝負獨立且勝率一樣為x05/16 10:00
5F→: 則1-x為每場輸的機率 1-(1-x)^5=0.3 為至少贏一場05/16 10:01
6F→: 解出x = 6.89%05/16 10:03
1F→: 31種 方法類似算走棋盤路徑數,又每次必上一列05/11 14:10
2F→: 倒數一步一定是A下那兩格,分別有1種路徑到A05/11 14:12
3F→: 倒數第二步是那兩格下三格分別有1,2,1種路徑到A...05/11 14:12
4F→: 最後可得甲中6格只有右邊5格可走到A,分別1,5,10,10,05/11 14:13
5F→: 5 種走法 加起來31種05/11 14:14
2F→: ?? 看不懂你的問題 照著我的作法先把圖畫出來吧05/11 01:56
3F→: https://goo.gl/nqrCNV05/09 21:58
1F→: C(9,2)/C(10,3) = 3/1005/09 00:12
2F→: 排容 3/10 + 3/10 - C(8,1)/C(10,3) = 8/1505/09 00:13
3F→: 排容 3*3/10 - 3*1/15 + 1/120 = 17/2405/09 00:15
1F→: [t^2] = 2 or 3 範圍都還沒積到05/05 11:26