Multiple Choice
For each of the following questions, determine whether the given formula is a wff or not. If it is a wff, indicate its main operator.
-[(P ≡ Q) • ∼Q] ⊃ (P ⊃ R)
A) It's a wff. The main operator is the ≡.
B) It's a wff. The main operator is the •.
C) It's a wff. The main operator is the ∼.
D) It's a wff. The main operator is the first ⊃, reading left to right.
E) Not a wff
Correct Answer:

Verified
Correct Answer:
Verified
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