Question

B = {x|x apartine numerelor naturale nenule si x +1 apartine D18

Answer 1

0+1 = 1 
1 + 1 = 2 
2+1 = 3 
5+1 = 6 
8+1 = 9 
17 + 1 = 18 
 B= { 1 , 2 , 3,6,9,18}

Answer 2

0+1=1
2+1=3
3+1=4
4+1=5
7+1=8
8+1=9
17+1=18
B=1 2 3 4 5 8 9 18