Question

There are 15 rows of seats in an auditorium. The first row has 20 seats, and each of the other rows has 5 more seats than the row in front. Which of the following is formed by the number of seats in each row?

A. an arithmetic series
B. an arithmetic sequence
C. a geometric series
D. a geometric sequence

Answer 1

Geometric is multiplication and division, and arithmetic is adding and subtracting.

They are adding by 5. This is arithmetic.

Answer 2

Option B is the correct answer.

Explanation:

There are 15 rows of seats in an auditorium. The first row has 20 seats, and each of the other rows has 5 more seats than the row in front.

This is an example of arithmetic progression with first term 20 and common difference 5. Number of terms is 15.

This is an example of arithmetic sequence.

Series means the sum of terms, sequence is the arrangement of numbers.

Option B is the correct answer.