74. Establish the rule according to which the table is composed, and exclude the "extra" number:

| $\frac{1}{3}$ | $\frac{1}{8}$ | $\frac{23}{7}$ |
| :---: | :---: | :---: |
| $3 \frac{2}{7}$ | $\frac{4}{11}$ | $\frac{1}{3}$ |
| 0.125 | $\frac{5}{13}$ | $\frac{4}{11}$ |
74. By representing the numbers in the table in a different form, we get

| $\frac{1}{3}$ | $\frac{1}{8}$ | $\frac{23}{7}$ |
| :---: | :---: | :---: |
| $\frac{23}{7}$ | $\frac{4}{11}$ | $\frac{1}{3}$ |
| $\frac{1}{8}$ | $\frac{5}{13}$ | $\frac{4}{11}$ |

From this table, it is clear that the numbers written in it, except for $\frac{5}{13}$, are pairwise equal. Therefore, the number $\frac{5}{13}$ should be excluded.