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2017++20242017+\ldots+2024

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Q. 2017++20242017+\ldots+2024
  1. Identify type of series: Identify the type of series.\newlineThe series 20172017, 20182018, ..., 20242024 is an arithmetic series because the difference between consecutive terms is constant.
  2. Find first and last term: Find the first term a1a_1 and the last term ana_n of the series.\newlineThe first term a1a_1 is 20172017 and the last term ana_n is 20242024.
  3. Calculate number of terms: Calculate the number of terms nn in the series.\newlineSince the series is consecutive integers from 20172017 to 20242024, we can find the number of terms by subtracting the first year from the last year and adding 11.\newlinen=20242017+1n = 2024 - 2017 + 1\newlinen=7+1n = 7 + 1\newlinen=8n = 8
  4. Use formula for sum: Use the formula for the sum of an arithmetic series.\newlineThe sum SnS_n of the first nn terms of an arithmetic series is given by:\newlineSn=n2(a1+an)S_n = \frac{n}{2} * (a_1 + a_n)
  5. Substitute values into formula: Substitute the values into the formula to find the sum.\newlineS8=82×(2017+2024)S_8 = \frac{8}{2} \times (2017 + 2024)\newlineS8=4×(4041)S_8 = 4 \times (4041)\newlineS8=16164S_8 = 16164
  6. Verify the result: Verify the result.\newlineTo check for a math error, we can quickly verify by adding the first and last term to see if it matches the sum we used in the formula:\newline2017+2024=40412017 + 2024 = 4041\newlineSince this matches the sum we used in the formula, it seems we have not made a math error.

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