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Find the sum of the first 10 terms of the following series, to the nearest integer.

6,12,24,dots
Answer:

Find the sum of the first 1010 terms of the following series, to the nearest integer.\newline6,12,24, 6,12,24, \ldots \newlineAnswer:

Full solution

Q. Find the sum of the first 1010 terms of the following series, to the nearest integer.\newline6,12,24, 6,12,24, \ldots \newlineAnswer:
  1. Identify type and ratio: Identify the type of series and the common ratio.\newlineThe series is geometric because each term is a multiple of the previous term. To find the common ratio, divide the second term by the first term.\newline126=2\frac{12}{6} = 2\newlineCommon Ratio: 22
  2. Use sum formula: Use the formula for the sum of the first nn terms of a geometric series.\newlineThe formula for the sum of the first nn terms (SnS_n) of a geometric series is:\newlineSn=a(1rn)(1r)S_n = \frac{a(1 - r^n)}{(1 - r)}, where aa is the first term, rr is the common ratio, and nn is the number of terms.
  3. Plug values into formula: Plug the values into the formula to find the sum of the first 1010 terms.a=6a = 6 (the first term)r=2r = 2 (the common ratio)n=10n = 10 (the number of terms)S10=6(1210)(12)S_{10} = \frac{6(1 - 2^{10})}{(1 - 2)}
  4. Calculate sum: Calculate the sum using the values from Step 33.\newlineS10=6(11024)/(12)S_{10} = 6(1 - 1024) / (1 - 2)\newlineS10=6(1023)/(1)S_{10} = 6(-1023) / (-1)\newlineS10=6×1023S_{10} = 6 \times 1023\newlineS10=6138S_{10} = 6138

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