Question

1. all of the following would make a formal proof incomplete except what? errors in logic a lack of justifications incomplete sentences incorrect reasons for statements

Explanation:

A formal proof requires logical coherence (errors in logic disrupt this), proper justifications (a lack makes it unsubstantiated), and correct reasoning (incorrect reasons for statements undermine validity). However, the form of sentences (whether they are complete or not) does not inherently make a formal proof incomplete as long as the logical structure, justifications, and reasoning are intact.

Answer:

Incomplete sentences