Tačan odgovor je 16.
Dodajte 2 na svaki broj i promenite “+” u “×”.
11 + 11 = 4 (1+1=2 × 1+1=2) ~ 2 x 2=4
12 + 12 = 9 (1+2=3 × 1+2=3) ~ 3 x 3=9
13 + 13 = 16 (1+3=4 × 1+3=4) ~ 4 x 4=16
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