In this lesson, we will learn how to calculate the sum of the terms in an arithmetic sequence with a definite number of terms.
Students will be able to
Q1:
Find the number of terms in the arithmetic sequence whose first term is 11 and last term is 81, where the sum of all the terms is 506.
Q2:
Find an expression for the sum of an arithmetic sequence whose first term is 𝑎 and whose common difference is 𝑑.
Q3:
Write an expression for the sum of the first 𝑛 terms of an arithmetic sequence with first term 𝑎 and last term 𝑙.
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