We never did inverse propositions when I had logic. The inverse of
if P then Q
is the proposition
if not P then not Q
We have
P: A triangle has three congruent angles
Q: it is an equilangular triangle
The inverse is thus if not P then not Q
If a triangle does not have three congruent angles then it is not an equilangular triangle.
Answer: First choice
The reason we didn't do inverses is it has the same truth value as the converse; the inverse is the contrapositive of the converse.
