Multiple choice general knowledge

Which number was a perfect number, according to Pythagoras?

  1. 7

  2. 8

  3. 9

  4. 10
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Pythagoras and his followers considered 10 to be a 'perfect number' because it represented the sum of the first four numbers (1+2+3+4=10) and could be represented as a triangular figure (tetractys). The number 10 had mystical significance in Pythagorean philosophy. Modern mathematics defines perfect numbers differently (like 6, 28, 496), but in Pythagorean context, 10 is correct.

Keep practicing — related questions