If all birds can fly and some animals cannot fly, which of the following must be

Practice Questions

Q1
If all birds can fly and some animals cannot fly, which of the following must be true?
  1. Some animals are not birds.
  2. All animals are birds.
  3. All birds are animals.
  4. Some birds cannot fly.

Questions & Step-by-Step Solutions

If all birds can fly and some animals cannot fly, which of the following must be true?
  • Step 1: Understand that all birds can fly. This means every bird has the ability to fly.
  • Step 2: Recognize that some animals cannot fly. This means there are animals that do not have the ability to fly.
  • Step 3: Since all birds can fly, any animal that cannot fly cannot be a bird.
  • Step 4: Therefore, it must be true that some animals are not birds because there are animals that cannot fly.
  • Logical Deduction – The ability to draw conclusions based on given premises.
  • Categorical Logic – Understanding relationships between different categories (e.g., birds and animals) based on their properties.
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