### Home > INT3 > Chapter 10 > Lesson 10.1.4 > Problem10-54

10-54.

Write each series in sigma notation and calculate the sum or an expression for the sum.

1. $47 + 34 + 21 + …+ \left(–83\right)$

What is the expression for the sequence?

How many terms are there in the series?

$\displaystyle\sum_{k = 1}^{11}(60-13k)=-198$
1. $3 + 10 + 17 + … + \left(7n – 4\right)$
Instead of going up to a specific term, this series sums up the first $n$ terms of the sequence given in parentheses.