A 20-row theater has three sections of seating. In each section,
the number of seats in a row increases by one with each successive row. The
first row of the middle section has 10 seats. The first row of each of the two side
sections has 4 seats.
a. Find the total number of chairs in each section. Then find the total seating
capacity of the theater.
b. Write an arithmetic series to represent each section.
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