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Watch Later 3:21

4.2.1 & 4.2.2 從 n 個不同物件中每次選取n個物件作無重排列

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4.1.2 Multiplication Rule

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4.1.2 乘法法則

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4.1.1 Addition Rule

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4.1.1 加法法則

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Conditional Sentences_Type 0 &Type 1

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Present Perfect Tense_Since VS For

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Introduction to reported speech

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Past Continuous Tense _When VS While

YU CHUN KEUNG MEMORIAL COLLEGE