Question

18 supra 2n-1,apartine Z



Va roggg rapiddd

Answer 1

18/(2n-1) € Z

2n-1 | 18

2n-1 € D 18

2n-1 € { 1; 2; 3; 6; 9; 18} | +1

2n € { 2; 3; 4; 7; 10; 19} | : 2

n € { 1; 1,5; 2; 3,5; 5; 9,5}