The sum of the first 5 terms of GP: 2, 6, 18, 54, ... is $x$.
Answer (integer)
242
Solution
a=2, r=3, n=5. S₅ = a(rⁿ-1)/(r-1) = 2(3⁵-1)/(3-1) = 2(243-1)/2 = 242.
About this question
Subject: Mathematics · Chapter: Sequences and Series · Topic: Geometric Progression
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