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Find the sum of the first 7 terms of the following series, to the nearest integer.

6,9,(27)/(2),dots
Answer:

Find the sum of the first 77 terms of the following series, to the nearest integer.\newline6,9,272, 6,9, \frac{27}{2}, \ldots \newlineAnswer:

Full solution

Q. Find the sum of the first 77 terms of the following series, to the nearest integer.\newline6,9,272, 6,9, \frac{27}{2}, \ldots \newlineAnswer:
  1. Identify Pattern: The given series is not an arithmetic or geometric series, but we can observe a pattern in the first three terms. The first term is 66, the second term is 99 which is 1.51.5 times the first term, and the third term is (27/2)(27/2) which is 1.51.5 times the second term. This suggests that each term is 1.51.5 times the previous term, indicating that the series is a geometric series with the first term a=6a = 6 and the common ratio r=1.5r = 1.5.
  2. Apply Geometric Series Formula: To find the sum of the first 77 terms of a geometric series, we use the formula for the sum of the first nn terms of a geometric series, which is Sn=a(1rn)/(1r)S_n = 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. Substitute Values: We will now apply the formula with a=6a = 6, r=1.5r = 1.5, and n=7n = 7 to find the sum of the first 77 terms.S7=6(11.57)(11.5)S_{7} = \frac{6(1 - 1.5^{7})}{(1 - 1.5)}
  4. Calculate Exponent: Calculating the value of 1.571.5^{7} and then substituting it into the formula.\newline1.5717.08593751.5^{7} \approx 17.0859375\newlineS7=6(117.0859375)(11.5)S_{7} = \frac{6(1 - 17.0859375)}{(1 - 1.5)}
  5. Perform Subtraction: Now, we will perform the subtraction in the numerator and the denominator. S7=6(16.0859375)(0.5)S_{7} = \frac{6(-16.0859375)}{(-0.5)}
  6. Calculate Sum: Finally, we will calculate the sum by performing the multiplication and division.\newlineS7=96.5156250.5S_{7} = \frac{-96.515625}{-0.5}\newlineS7193.03125S_{7} \approx 193.03125
  7. Round to Nearest Integer: Since we need to find the sum to the nearest integer, we will round 193.03125193.03125 to the nearest integer.\newlineS7193S_{7} \approx 193

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