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Find the numerical answer to the summation given below.

sum_(n=3)^(79)(6n+4)
Answer:

Find the numerical answer to the summation given below.\newlinen=379(6n+4) \sum_{n=3}^{79}(6 n+4) \newlineAnswer:

Full solution

Q. Find the numerical answer to the summation given below.\newlinen=379(6n+4) \sum_{n=3}^{79}(6 n+4) \newlineAnswer:
  1. Split Summation: Recognize that the summation of the series can be split into two separate summations, one for 6n6n and one for 44. This gives us n=3796n+n=3794\sum_{n=3}^{79}6n + \sum_{n=3}^{79}4.
  2. Evaluate First Term: Evaluate the first term n=3796n\sum_{n=3}^{79}6n. This is an arithmetic series, and the sum of an arithmetic series can be found using the formula S=n2×(a1+an)S = \frac{n}{2} \times (a_1 + a_n), where nn is the number of terms, a1a_1 is the first term, and ana_n is the last term. The first term when n=3n=3 is 6×3=186\times3 = 18, and the last term when n=79n=79 is 6×79=4746\times79 = 474. The number of terms is 793+1=7779 - 3 + 1 = 77.
  3. Calculate First Term Sum: Calculate the sum of the first term n=3796n\sum_{n=3}^{79} 6n using the arithmetic series sum formula.\newlineS=772×(18+474)S = \frac{77}{2} \times (18 + 474)\newline=38.5×492= 38.5 \times 492\newline=18954= 18954
  4. Evaluate Second Term: Evaluate the second term n=3794\sum_{n=3}^{79} 4. This is a constant series, and the sum of a constant series is simply the constant times the number of terms. We already found the number of terms to be 7777 in Step 22.
  5. Calculate Second Term Sum: Calculate the sum of the second term n=3794\sum_{n=3}^{79}4.S=4×77S = 4 \times 77=308= 308
  6. Add Results: Add the results from Step 33 and Step 55 to get the final answer.\newlineTotal Sum = 18954+30818954 + 308\newline= 1926219262

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