Question

Which is not a Pythagorean Triple?

three, four, five

four, twelve, twenty-four

five, twelve, thirteen

nine, forty, forty-one

Answer 1

Do you know what it means for three numbers to be considered a "Pythagorean Triple"?

Answer 2

no

Answer 3

That means you can plug them into the equation:

a^2+b^2=c^2

And it should be true. If it isn't true, then they are not a triple.