Thornton Township High School is a public high school of the Thornton Twp Hsd 205 School District located in Harvey, IL. It has 1,802 students in grades 9th through 12th. Thornton Township High School is the 116th largest public high school in Illinois and the 2,072nd largest nationally.
Sum of the First n Terms of a Sequence. The sum of the terms of a sequence is called a series. If a sequence is arithmetic or geometric there are formulas to find the sum of the first n terms, denoted Sn, without actually adding all of the terms.um of the First n Terms of a Sequence. The sum of the terms of a sequence is called a series. If a sequence is arithmetic or geometric there are formulas to find the sum of the first n terms, denoted Sn, without actually adding all of the terms.
Rule for a Geometric Sequence. The n th term of a geometric sequence is identified as a (n). For instance, a (1) is the first term of the sequence, and a (7) is the seventh term of the sequence. To get from one term of a sequence to the next, we need to multiple the preceding term by the common ratio r.