Question

Which of the following sets of integers is not a Pythagorean triple?

Answer 1

7, 24, 25

13, 84, 85

10, 24, 25

20, 21, 29

Answer 2

A Pythagorean triple is any three numbers where a^2 + b^2 = c^2 (i.e. the sum of the squares of the smaller numbers = the square of the larger number). Try and find which of the above options meet this criteria - or rather, which don't.

Answer 3

"Any three numbers" being "any real positive integers" but that's another matter.