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$$(A'+C'+D')(A'+C')(C'+D')$$

how to simplify it. i got $A'D'C'$, but it's probably wrong. can someone help me

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    Welcome to Math.SE! The idea is that you provide some thoughts or work in addition to just a question like this ... So, can you show us your work how you got to A'D'C'?2017-02-17

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I'll help you with the simplifying: $$\begin{align}(A'+C'+D')(A'+C')(C'+D') &= C'+ (A'+D')(A'D') \\ \\ &= \color{blue}{C'+ A'D'}\end{align}$$