Andrew G. answered 12/16/21
College Philosophy/Social Science, and High School English Tutor
A well-formed formula must be able to convey the specific proposition so that it can be translated into a sentence. As it stands, a sentence that could be derived from A v ~~B is "Either there are apples, or it is not the case that there is no broccoli." So A v ~~B is a well-formed formula.