The number of seats in the rows of a school auditorium form an arithmetic progression. The first row contains 30 seats and each subsequent row has 2 more seats than the preceding one.
(i) Which row contains exactly 80 seats?
(ii) The auditorium has 40 rows in all. Does any row contain exactly 120 seats? Give reasons for your answer.
(iii) Determine the number of seats in the last row.