Problem

1997 Fermat Problem 18

Given A=\{1, 2, 3, 5, 8, 13, 21, 34, 55\}, how many of the numbers between 3 and 89 cannot be written as the sum of two elements of the set?

\textbf{(A)}\ 43\quad \textbf{(B)}\ 36\quad \textbf{(C)}\ 34\quad \textbf{(D)}\ 55\quad \textbf{(E)}\ 51

If there are no answer choices shown, enter a numerical answer.


Full credit to this problem is given to the CEMC, you may view all Fermat contests here.


Show/Hide Problem Tags

Problem Tags: No tags

Want to contribute problems and receive full credit? Click here to add your problem!
Please report any issues to us in our Discord server
Go to previous contest problem (SHIFT + Left Arrow) Go to next contest problem (SHIFT + Right Arrow)