Assume T is true (1), F is false (0) and U (?) is unknown, what is the value of the following? (∼F v U)

Question

Assume T is true (1), F is false (0) and U (?) is unknown, what is the value of the following? 

(∼F v U)

Answer 1

The value of (~F v U) = true = 1. Since F is false, ~F is true. Thus, (~F v U) = (true v unknown). Disjunctions are true if and only if one (or both) of the disjuncts is true. Since we know ~F is true, the disjunction (~F v U) is also true and hence (~F v U) = 1.