Egg, Banana, Apple, Walnut, Tangerine, and Avocado

The title sounds like a list of healthy foods. However, this list is from the homework I gave to my students.

Puzzle. Which one doesn’t belong: egg, banana, apple, walnut, tangerine, or avocado?

The book answer was apple as the only one which we can eat without peeling.

Other students suggested a lot of reasons why egg is the odd one out.

  • Egg is the only one not grown from a plant.
  • Egg is the only one without a letter a.
  • Egg is the only one you can’t eat without cooking.

Overall, the students found reasons for each of them. In addition to the above, we have the following.

  • Banana is the only one not in a spherical or ellipsoidal shape.
  • Walnut is the only word without repeated letters.
  • Tangerine is the only word with a square number of letters, and it is also the only citrus.
  • Avocado is the only word with more vowels than consonants.

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