問題詳情
4. Define S = {a, b, c, d, e).(20 pts)
【題組】(a) How many permutations are there to arrange a〜e in a row such that a and e are not together;
參考答案
答案：D
難度：簡單0.77114
統計：A(67),B(4),C(58),D(839),E(0)
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