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Find the sum of the first 10 terms of the following sequence. Round to the nearest hundredth if necessary.

12,quad2,quad(1)/(3),dots
Sum of a finite geometric series:

S_(n)=(a_(1)-a_(1)r^(n))/(1-r)
Answer:

Find the sum of the first 1010 terms of the following sequence. Round to the nearest hundredth if necessary.\newline12,2,13, 12, \quad 2, \quad \frac{1}{3}, \ldots \newlineSum of a finite geometric series:\newlineSn=a1a1rn1r S_{n}=\frac{a_{1}-a_{1} r^{n}}{1-r} \newlineAnswer:

Full solution

Q. Find the sum of the first 1010 terms of the following sequence. Round to the nearest hundredth if necessary.\newline12,2,13, 12, \quad 2, \quad \frac{1}{3}, \ldots \newlineSum of a finite geometric series:\newlineSn=a1a1rn1r S_{n}=\frac{a_{1}-a_{1} r^{n}}{1-r} \newlineAnswer:
  1. Identify terms and values: First, identify the first term a1a_1, the common ratio rr, and the number of terms nn in the sequence.\newlineThe first term a1a_1 is 1212.\newlineThe second term is 22, so the common ratio rr can be found by dividing the second term by the first term: r=212=16r = \frac{2}{12} = \frac{1}{6}.\newlineThe number of terms nn we want to find the sum of is 1010.
  2. Calculate common ratio: Now, use the formula for the sum of the first nn terms of a geometric series: Sn=a1a1rn1rS_n = \frac{a_1 - a_1 \cdot r^n}{1 - r} Plug in the values we have: a1=12a_1 = 12, r=16r = \frac{1}{6}, and n=10n = 10.
  3. Use formula for sum: Calculate the value of rn(16)10r^n (\frac{1}{6})^{10}. This requires a calculator or a software tool to find the precise value.
  4. Calculate rnr^n: After calculating (16)10(\frac{1}{6})^{10}, we find that it is a very small number (approximately 1.65381717×1081.65381717\times10^{-8}).\newlineFor practical purposes, when subtracting this value from 1212 in the numerator, it will have an insignificant effect, so we can approximate the numerator to be just 1212.
  5. Approximate numerator: Now, calculate the denominator (1r)=(116)=56(1 - r) = (1 - \frac{1}{6}) = \frac{5}{6}.
  6. Calculate denominator: Finally, calculate the sum S10S_{10} using the approximated numerator and the calculated denominator:\newlineS10(120)/(56)S_{10} \approx (12 - 0) / (\frac{5}{6})\newlineS1012/(56)S_{10} \approx 12 / (\frac{5}{6})\newlineS1012×(65)S_{10} \approx 12 \times (\frac{6}{5})\newlineS1014.4S_{10} \approx 14.4

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