Answer:Arithmetic sequence is also known as the algebraic pattern. In this pattern, sequences are based on the addition or subtraction of the terms. if two or more terms in the sequence are given, we can use addition or subtraction to find the arithmetic pattern.Step-by-step explanation: For example:1, 3, 5, 7, 9, _, 13, _To find the missing terms we need to use the rule "Add two to the previous term to get the next term."In the example given above take the second term (3) if we add "2" to the second term (3) we get the third term 5.First missing term: the previous term is. Therefore 9 + 2 = 11Second missing term: the previous term is 13. So, 13 + 2 = 151, 3, 5, 7, 9, 11, 13, 15