1. 1
2. 10
3. 11
4. 100
5. 101
6. 110
7. 111
8. 1000
9. 1001
10. 1010
11. 1011
12. 1100
13. 1101
14. 1110
15. 1111
16. 10000
17. 10001
18. 10010
19. 10011
20. 10100
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1 + 1 = 10 in binary numbers.
19
The only two binary numbers are 0 and 1.
The sum of binary numbers is also a binary number.
That's not a binary number ! Binary numbers can only use the digits 1 and 0.