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- Let \( M \) be the number of species that migrate, \( H \) be the number that hibernate, and \( B \) be the number that both migrate and hibernate.
- Given: \( M = 23 \), \( H = 18 \), and \( M \cap H = 7 \).
- Species that either migrate or hibernate is given by the formula:
- Therefore, species that neither migrate nor hibernate:
- - 34 = 22
- Problem:** A weather station records that over a week, the temperature rose on 5 days, dropped on 3 days, and remained stable on 2 days. On 2 days, both rising and stable were recorded due to mixed weather, but these are not mutually exclusive. If on 1 day the temperature both rose and dropped due to anomalies, how many days showed a clear rise?