64. Environmental knowledge quiz has $A, B, C$ three questions. The table below shows the statistics of the answers. Among them, the number of people who only got two questions right is $\qquad$, and the number of people who only got one question right is $\qquad$.
\begin{tabular}{|c|c|c|c|c|c|c|}
\hline & Total number of people & Correct for $A$ & Correct for $B$ & Correct for $C$ & All wrong & All correct \\
\hline Number of people & 40 & 10 & 13 & 15 & 15 & 1 \\
\hline
\end{tabular}
Reference answer: 11,13

Key point: Mathematical principle - Principle of Inclusion-Exclusion