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In this lesson, we will learn how to calculate the sum of a given arithmetic series or a specific number of terms in it.

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 the number of terms for which the sum of the sequence ( 1 6 0 , 1 4 4 , 1 2 8 , ) is 0.

Q3:

An employee’s annual salary in his first year was 6 500 LE. Every year his salary exceeded that of the year before by 240 LE. Find after how many years his annual salary would be 8 420 LE, and then find out the total salary he received during this period.

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