Arithmetic

Arithmetic

Example 1

Find the sum of the first five terms (S5) of the arithmetic sequence 1, 4, 7, 10, 13 …

Step 1. Determine the number of terms to add.

S5 = a1 + a2 + a3 + a4 + a5

Step 2. Add the terms.

S5 = 1 + 4 + 7 + 10 + 13
S5 = 35