Úloha ID 1770 - 
Jsou dána dvě tvrzení:
A: Jestliže mám psa, pak mám i kočku.
B: Mám psa, právě když nemám kočku.
Z následujících tvrzení vyberte ekvivalentní tvrzení k A a negaci k tvrzení B.
1. Jestliže nemám kočku, pak mám psa.
2. Nemám kočku a nemám psa, nebo mám kočku a psa.
3. Mám kočku nebo nemám psa.
Správná odpověď je: B
| P | K | A | ¬B | 1 | 2 | 3 |
| 1 | 1 | 1 | 1 | 1 | 1 | 1 |
| 1 | 0 | 0 | 0 | 1 | 0 | 0 |
| 0 | 1 | 1 | 0 | 1 | 0 | 1 |
| 0 | 0 | 1 | 1 | 0 | 1 | 1 |
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