Murphy Martin
06/12/2023 · Elementary School
\( \frac { 1 } { 3 } + \frac { 1 } { 3 ^ { 2 } } + \ldots + \frac { 1 } { 3 ^ { 2024 } } \)
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Tutor-Verified Answer
Step-by-step Solution
The given series is
\[
S = \frac{1}{3} + \frac{1}{3^2} + \frac{1}{3^3} + \ldots + \frac{1}{3^{2024}}.
\]
This is a geometric series where the first term \( a = \frac{1}{3} \) and the common ratio \( r = \frac{1}{3} \). The number of terms in the series is 2024.
The formula for the sum of the first \( n \) terms of a geometric series is given by:
\[
S_n = a \frac{1 - r^n}{1 - r},
\]
where \( a \) is the first term, \( r \) is the common ratio, and \( n \) is the number of terms.
In our case, we have:
- \( a = \frac{1}{3} \)
- \( r = \frac{1}{3} \)
- \( n = 2024 \)
Substituting these values into the formula, we get:
\[
S = \frac{1}{3} \cdot \frac{1 - \left(\frac{1}{3}\right)^{2024}}{1 - \frac{1}{3}}.
\]
Calculating \( 1 - \frac{1}{3} \):
\[
1 - \frac{1}{3} = \frac{2}{3}.
\]
Now substituting this back into the sum formula:
\[
S = \frac{1}{3} \cdot \frac{1 - \left(\frac{1}{3}\right)^{2024}}{\frac{2}{3}}.
\]
This simplifies to:
\[
S = \frac{1}{3} \cdot \frac{3}{2} \left(1 - \left(\frac{1}{3}\right)^{2024}\right).
\]
The \( \frac{3}{3} \) cancels out:
\[
S = \frac{1}{2} \left(1 - \left(\frac{1}{3}\right)^{2024}\right).
\]
Thus, the final result for the sum of the series is:
\[
\boxed{\frac{1}{2} \left(1 - \frac{1}{3^{2024}}\right)}.
\]
Quick Answer
The sum of the series is \( \frac{1}{2} \left(1 - \frac{1}{3^{2024}}\right) \).
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