Proof by contradiction would be used for which of the following?
A) The proof that the square root of five is irrational.
B) The proof that the sum of two odd numbers is an odd number.
C) The proof that the square of an even number is an even number.
D) The proof that if the cube of a number is divisible by three then the number is divisible by three.
E) none of these

Question

Proof by contradiction would be used for which of the following?
A) The proof that the square root of five is irrational.
B) The proof that the sum of two odd numbers is an odd number.
C) The proof that the square of an even number is an even number.
D) The proof that if the cube of a number is divisible by three then the number is divisible by three.
E) none of these

zepdrix · Answer

Can we only pick one option? :o

anonymous · Answer

yeah, this is whats on my online quiz and it wont allow me to click two.

anonymous · Answer

@zepdrix

zepdrix · Answer

Hmm well I can say pretty confidently that to prove that square root 5 is irrational:
~You would assume that sqrt5 is `rational`.
~Then through some different steps you can show there it leads to a contradiction.

anonymous · Answer

wow, thank you! i think that i was over thinking this whole problem thinking i couldnt contradict that answer because the square root of 5 is irrational therefore it is true. @zepdrix