Mathematical and Physical Journal
for High Schools
Issued by the MATFUND Foundation
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Problem C. 1311. (October 2015)

C. 1311. Each of the numbers \(\displaystyle \frac{1}{3}\); 0,375; 1; 1,4; \(\displaystyle \sqrt{2}\); \(\displaystyle \frac{13}{8}\); 2; \(\displaystyle \frac{13}{5}\); \(\displaystyle \frac{8}{3}\); 3; 4; \(\displaystyle \sqrt{18}\); \(\displaystyle \sqrt{32}\) is given either a plus sign or a minus sign, and then the sum is calculated. In how many different ways may we choose the signs to get \(\displaystyle 1\) as a sum?

(5 pont)

Deadline expired on November 10, 2015.


225 students sent a solution.
5 points:78 students.
4 points:41 students.
3 points:68 students.
2 points:27 students.
1 point:4 students.
0 point:3 students.
Unfair, not evaluated:4 solutions.

Problems in Mathematics of KöMaL, October 2015