Răspuns :
5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20
impare;5,7,9,11,13,15,17,19
deci:se gasesc 8
impare;5,7,9,11,13,15,17,19
deci:se gasesc 8
5; 6; 7; 8; 9; 10; 11; 12; 13; 14; 15; 16; 17; 18; 19; 20;
impare = 5; 7; 9; 11; 13; 15; 17; 19 ⇒ 8 numere impare