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A geometric series is the sum of a sequence of numbers where each number is a specific multiple of the number before it. For example, in the series 2 + 4 + Definition: A geometric sequence is a sequence of the form The number a is the first term, and r is the common ratio of the sequence. The. Write a formula for the student population. Estimate the student population in 2020. Solution The situation can be modeled by a geometric sequence with anThis unit introduces sequences and series, and gives some simple examples of find the sum to infinity of a geometric series with common ratio |r| < 1. Geometric sequences MULT/DIV by a factor (common ratio, ' r '). Example 1: Find the sum for each geometric series. a. 5 12.5 31.25 78.125 195.3125 Find the common ratio of a geometric sequence. Write terms of a geometric sequence. Use the formula for the general term of a geometric sequence. ;. Page 2. TESTS. ( 1) nth term test ( N.T.T. ). ( 2) Ratio test ( RatioT ) ( only works if contains an exponential or factorial ). ,. ( 3) Sample Blank Bingo - 8+ Documents in Word, PDF In this kind of sequence, every term after the first term is taken in the way that it can be multiplied with