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Find the numerical answer to the summation given below.

sum_(n=1)^(70)(3n+10)
Answer:

Find the numerical answer to the summation given below.\newlinen=170(3n+10) \sum_{n=1}^{70}(3 n+10) \newlineAnswer:

Full solution

Q. Find the numerical answer to the summation given below.\newlinen=170(3n+10) \sum_{n=1}^{70}(3 n+10) \newlineAnswer:
  1. Recognize Split Summations: Recognize that the summation of the series can be split into two separate summations: the summation of 3n3n from n=1n=1 to 7070 and the summation of 1010 from n=1n=1 to 7070. This can be written as n=170(3n)+n=170(10)\sum_{n=1}^{70}(3n) + \sum_{n=1}^{70}(10).
  2. Calculate 3n3n Summation: Calculate the first summation n=170(3n)\sum_{n=1}^{70}(3n). This is an arithmetic series where each term is 33 times the corresponding term of the sum of the first 7070 natural numbers. The sum of the first mm natural numbers is given by the formula m(m+1)2\frac{m(m+1)}{2}. Therefore, the sum of 3n3n from 11 to 7070 is 3×(70(70+1)2)3 \times \left(\frac{70(70+1)}{2}\right).
  3. Calculate 3n3n Sum: Perform the calculation from Step 22. \newline3×(70(70+1)2)=3×(70×712)=3×(4970)=149103 \times \left(\frac{70(70+1)}{2}\right) = 3 \times \left(\frac{70\times71}{2}\right) = 3 \times (4970) = 14910.
  4. Calculate 1010 Summation: Calculate the second summation n=170(10)\sum_{n=1}^{70}(10). Since 1010 is a constant, the sum is simply 1010 added to itself 7070 times, which is 10×7010\times70.
  5. Calculate 1010 Sum: Perform the calculation from Step 44. \newline10×70=70010\times70 = 700.
  6. Find Total Sum: Add the results from Step 33 and Step 55 to find the total sum of the series. 14910+700=1561014910 + 700 = 15610.

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