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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, and duck D must be beofre duck B?

 Jul 28, 2021
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We have ADB and C can go anywhere. C can be before the A, in the middle of A&D, in the middle of D&B, after B. That's $4$ ways.

 Jul 28, 2021

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