Answer:
Option B. An arithmetic sequence
Step-by-step explanation:
There are 15 rows of seats in an auditorium. The first row has 20 seats, and each row has 5 more seats than the row in front.
This means sequence formed for seats will be
20, (20+5), (20+5+5), (20+5+5+5)..................20 rows
Or 20, 25, 30, 35, 40,......................20 rows
Since every term of this sequence is 5 more than its previous term.
Means there is a common difference of 25 - 20 = 5
Therefore, the sequence formed is an arithmetic sequence.
Please note it's a sequence because it has finite terms. If the sequence has infinite terms then this sequence will be called as series.
Option B. Arithmetic sequence is the answer.
