2 comments

  • Sunday, Nov 05 2017

    Thank you so much!

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  • Sunday, Nov 05 2017

    /U (---) R2 indicates a bi-conditional relationship. So you should review the lesson on Bi-Conditionals here: https://classic.7sage.com/lesson/advanced-bi-conditionals/

    The 3rd rule says /U ---> R2, and the 4th rule says R2 --> /U. What is the contrapositive of each rule? /R2 ---> U and U --> /R2. So the contrapositive is U (---) /R2

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