Answer:
a) is TRUE
b) is FALSE
c) is TRUE
Step-by-step explanation:
Let's call the propositions
P: Laura is in the seventh grade
Q: Laura got an A on the mathematics test
R:Sarah got an A on the mathematics test
Then we have that the following propositions are true
P, Q v R (Q or R) and R---> ~P (if R then not P)
By watching at the truth table attached, we can see that the only row that satisfies all that conditions is the second one highlighted.
From there we can deduct that,
a) is TRUE
b) is FALSE
c) is TRUE
