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Find the sum of the first 48 terms of the following series, to the nearest integer.

2,7,12,dots
Answer:

Find the sum of the first 4848 terms of the following series, to the nearest integer.\newline2,7,12, 2,7,12, \ldots \newlineAnswer:

Full solution

Q. Find the sum of the first 4848 terms of the following series, to the nearest integer.\newline2,7,12, 2,7,12, \ldots \newlineAnswer:
  1. Identify Terms and Numbers: Identify the first term a1a_1, common difference dd, and number of terms nn in the arithmetic series.\newlineThe first term a1a_1 is 22, the common difference dd is 72=57 - 2 = 5, and the number of terms nn is 4848.
  2. Use Arithmetic Series Formula: Use the formula for the sum of the first nn terms of an arithmetic series: Sn=n2×(2a1+(n1)d)S_n = \frac{n}{2} \times (2a_1 + (n - 1)d). We will plug in the values for a1a_1, dd, and nn into the formula.
  3. Calculate Expression Inside Parentheses: Calculate the sum using the values: S48=482×(2×2+(481)×5)S_{48} = \frac{48}{2} \times (2\times2 + (48 - 1)\times5). First, calculate the expression inside the parentheses: 2×2+47×5=4+235=2392\times2 + 47\times5 = 4 + 235 = 239.
  4. Calculate Sum: Now, calculate the sum: S48=24×239S_{48} = 24 \times 239. Perform the multiplication: S48=5736S_{48} = 5736.
  5. Round to Nearest Integer: Round the sum to the nearest integer. The sum S48S_{48} is already an integer, so rounding is not necessary.

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