21–42. Geometric series Evaluate each geometric series or state that it diverges.

27.1 + 1.01 + 1.01² + 1.01³ + ⋯

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Identify the first term \( a \) and the common ratio \( r \) of the geometric series. Here, the first term is \( a = 1 \) and the common ratio is \( r = 1.01 \).

Recall that a geometric series \( a + ar + ar^2 + ar^3 + \cdots \) converges if and only if the absolute value of the common ratio \( |r| < 1 \).

Check the value of \( |r| \). Since \( r = 1.01 \), which is greater than 1, the series does not satisfy the convergence condition.

Conclude that because \( |r| > 1 \), the geometric series diverges and does not have a finite sum.

Therefore, the series \( 1 + 1.01 + 1.01^2 + 1.01^3 + \cdots \) diverges and cannot be evaluated to a finite value.

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주요 개념

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Geometric Series

A geometric series is a sum of terms where each term is found by multiplying the previous term by a constant ratio. It has the form a + ar + ar² + ar³ + ⋯, where a is the first term and r is the common ratio.

Convergence and Divergence of Geometric Series

A geometric series converges if the absolute value of the common ratio |r| is less than 1, meaning the terms get smaller and approach zero. If |r| ≥ 1, the series diverges and does not have a finite sum.

Sum Formula for Convergent Geometric Series

When a geometric series converges, its sum can be calculated using the formula S = a / (1 - r), where a is the first term and r is the common ratio. This formula provides the finite sum of infinitely many terms.

21–42. Geometric series Evaluate each geometric series or state that it diverges. 27.1 + 1.01 + 1.01² + 1.01³ + ⋯