問題詳情
5. 某班有 30 位學生，其中 20 位男生、10 位女生。今任選二位擔任班長和副班長，若規定其中一位是男生，另一位是女生，則共有幾種選法？
(A) 200
(B) 400
(C) 435
(D) 870
(A) 200
(B) 400
(C) 435
(D) 870
參考答案
無參考答案
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