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A,B,C are three persons among 7 persons who speak at a function. The number of ways in which it can be done if ′A′ speaks before ′B′ and ′B′ speaks before ′C′ is

Answer» A,B,C are three persons among 7 persons who speak at a function. The number of ways in which it can be done if A speaks before B and B speaks before C is


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