Is it always true?
The question
The sum of four consecutive numbers is a multiple of 4.
The sum of four consecutive numbers is a multiple of 4.
The sum of four consecutive numbers is a multiple of 4.
alwayssometimesnever
alwayssometimesnever
never
- One example that works does not prove "always" — but one that fails is enough to disprove it.
- So look for a counter-example: a case where the claim breaks.
- Try 14 and 15 and 16 and 17 — it fails, and so does every other case. So the answer is never.
How it works.
- 01
One example that works does not prove "always" — but one that fails is enough to disprove it.
- 02
So look for a counter-example: a case where the claim breaks.
- 03
Try 14 and 15 and 16 and 17 — it fails, and so does every other case. So the answer is never.