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Deven has four ducks labeled A, B, C, and D. How many ways are there for Deven to arrange his ducks in a row if duck A must be before duck D?

 Aug 18, 2020
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Could be   ADxx  AxDx AxxD  xADx  xAxD  xxAD    six ways for A before D

    the other two slots have two ways to arrange

6 x 2 = 12 ways

 Aug 18, 2020

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