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Cerrena [4.2K]
3 years ago
10

The sum of the reciprocal of a number and 2/3 is 23/30. Find the number

Mathematics
2 answers:
Illusion [34]3 years ago
8 0
2/3=3/2 and 23/30=30/23.
andreyandreev [35.5K]3 years ago
8 0
Reciprocal of a number a/b is b/a

b/a times 2/3=23/30
times bot sides by 3/2
b/a=69/60
b/a=23/10

the number is a/b

23/10=b/a
10/23=a/b
the number is 10/23
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The given series is conditionally convergent. This can be obtained by using alternating series test first and then comparing the series to the harmonic series.

<h3>Determine if diverges, converges, or converges conditionally:</h3>

Initially we need to know what Absolute convergence and Conditional convergence,

If \sum|a_{n} | → converges, and \sum a_{n} → converges, then the series is Absolute convergence

If \sum|a_{n} | → diverges, and \sum a_{n} → converges, then the series is Conditional convergence

First use alternating series test,

\lim_{k \to \infty} \frac{k^{5} +1}{k^{6}+11 } = \lim_{n \to \infty} \frac{5}{6k} = 0,

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Next by comparing the series to harmonic series,

\sum^{\infty} _{k=2}|(-1)^{k+1} \frac{k^{5} +1}{k^{6}+11 }|=\sum^{\infty} _{k=2}\frac{k^{5} +1}{k^{6}+11 } ≈  \sum^{\infty} _{k=2}\frac{1}{k} = 0

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First we got that the series is converging and then we got the series is divergent. Therefore the series is conditionally convergent.

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Hence the given series is conditionally convergent.

Learn more about conditionally convergent here:

brainly.com/question/1580821

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