Răspuns:
{1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19}<20
1² = 1
2² = 4
3² = 9
4² = 16
5² = 25
6² = 36
7² = 49
8² = 64
9² = 81
10² = 100
11² = 121
12² = 144
13² = 169
14² = 196
15² = 225
16² = 256
17² = 289
18² = 324
19² = 361
==EVERGREEN==
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