Back to Derive geometric series formula — Problem 2 · Task Set 7

HSA.SSE.B.4 Tutor Intake — Geometric Series Formula

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Grade 9·10 problems·~15 min·Common Core Math - HS Algebra·standard·hsa-sse-b-4

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Procedures

Find the sum of the geometric series $1 + 3 + 9 + 27 + 81 + 243$
using the formula $S = \dfrac{a(r^n - 1)}{r - 1}$ with
$a = 1$ , $r = 3$ , $n = 6$ .

Enter the sum $S$ .