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.

### Statistics:

 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