Can you paint every number from 1 to 8 with two colours, such that there are no distinct numbers $a, b, c$ of the same colour with $a+b=c$? For example, you cannot have 2, 3 and 5 of the same colour since $2+3=5$.

Good luck!


1 Answer 1


How about this

Red - $\{1,2,4,8\}$
Blue - $\{3,5,6,7\}$

  • $\begingroup$ Correct! Well done. $\endgroup$ Oct 18, 2019 at 11:30

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service and acknowledge you have read our privacy policy.

Not the answer you're looking for? Browse other questions tagged or ask your own question.