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1. ARITHMETIC SERIES

2. Arithmetic Series -an arithmetic series is the sum of all the terms of an arithmetic sequence. Example: 2,4,6,8  2+4+6+8 = 20 1,2,3,4,5  1+2+3+4+5 = 15

3. FORMULAS:  it is used when is given  it is used when is not given      

4. Examples: 1.) Given 5, 9, 13, 17,… find the . 2.) 2, 4, 6,…,20 find the sum first 10 even numbers. 3.) 1, 3, 5, 7,… find the 4.) 1,2,3,…,50 find the sum of the first 50 natural numbers.  

5. ACTIVITY # 1.3 Solve the following: 3, 7, 11, 15, 19,... find . 14, 23, 32, … 95. find . -7, -14, -21, -28, … find -10, -5, 0, 5, … 80. find . find .