--- tags: 機率與統計 title: 第九週活動 --- # 活動二 (a)(b)  ( c ) 我們認為應該多加幾個判斷詞去做交叉比對,例如:大大大優惠,或是記錄下哪些信箱特別常發廣告信或著每次都發給一堆人然後很常發.
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