Final answer:
To fill in the truth table for p -> (q -> r), consider all possible combinations of truth values for p, q, and r. Then, use the logical operation -> to evaluate p -> (q -> r) for each combination. The completed truth table will have 8 rows.
Step-by-step explanation:
In order to complete the truth table for p -> (q -> r), we need to consider all possible combinations of truth values for p, q, and r.
The truth table for p -> (q -> r) will have 8 rows, as there are 3 variables involved. We can fill in the row of the truth table as follows:
pqrp -> (q -> r)TTTTTTFFTFTTTFFTFTTTFTFTFFTTFFFT