"This statement is unlikely" - Can it be false? Well, 0/1 are dual to each other as always with negation; and so 2/3 are dual to each other with negation.
Now for the conjunction,disjunction truth tables:
A| B | A^B
1 1 1
0 1 0
0 0 0
1 2 2
1 3 3
0 2 0
0 3 0
2 2 2
3 3 3
3 2 3
Where you can take '2' as 'likely' and '3' as unlikely.
As you can see you can expand on any 2n-logic which is really based on binary logic.
The difficulty arises with odd valued logics.