Question

scrieti toate fractile de forma a/b unde a, b sunt nr naturale prime dinstincte cuprinse intre 6 si 18

Answer 1

a si b sunt numere prime distincte ...
a/b = {7/11 ; 11/7 ; 11/13 ; 13/11 ; 11/17 ; 17/11 ;}

Answer 2

1/2, 2/1
1/3, 3/1
1/5, 5/1
1/7, 7/1
1/11, 11/1
1/13, 13/1
2/3. 3/2
2/5, 5/2
2/7, 7/2
2/11, 11/2
2/13, 13/2
2/17, 17/2
3/5, 5/3
3/7, 7/3
3/11, 11/3
3/17, 17/3
5/7, 7/5
5/11, 11/7
5/13, 13/5
5/17,17/5
7/11, 11/7
11/13. 13/11 
13/17, 17/13