For part (a), the symbolic form is \( \sim q \rightarrow p \). For part (b), the correct symbolic form is \( \sim q \rightarrow p \).
Thus, the answers are:
\[
\boxed{\text{Part (a): } \sim q \rightarrow p}
\]
\[
\boxed{\text{Part (b): } \sim q \rightarrow p}
\]