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According to some political pundits, a person who is radical ($R$) is electable ($E$) if he/she is conservative ($C$), but otherwise is not electable.

  1. Which of the following are correct representations of this assertion?

    1. $(R\land E)\iff C$

    2. $R{:;{\Rightarrow}:;}(E\iff C)$

    3. $R{:;{\Rightarrow}:;}((C{:;{\Rightarrow}:;}E) \lor \lnot E)$

  2. Which of the sentences in (a) can be expressed in Horn form?