### Home > A2C > Chapter 12 > Lesson 12.3.1 > Problem12-120

12-120.

According to the school secretary, the size of the graduating class of Gauss High has steadily increased since it has opened. She claims that the number of graduates each year forms the sequence $t\left(n\right) = 30 + 12n$, where n is the number of years the high school has had students graduate. At the end of the year, the administration mails out invitations to all previous graduates to attend the upcoming graduation ceremony.

1. In this situation, what does a sequence represent? What does a series represent?

Remember that a sequence is a set of discrete numbers while a series is the sum of those numbers.

$\text{Use the summation formula }S_{10}=\frac{10}{2}\left(t\left(1\right) + t\left(10\right)\right)$