[理工] 一題工程機率
第二小題
突然卡住不會算
想法懂,但是算法不懂,又突然蹦出答案,上來請教大家
分母的部分
題目:http://ppt.cc/RbF3
答案:http://ppt.cc/HsQk 謝謝了~~
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