Q. Find the numerical answer to the summation given below.n=3∑79(6n+4)Answer:
Split Summation: Recognize that the summation of the series can be split into two separate summations, one for 6n and one for 4. This gives us ∑n=3796n+∑n=3794.
Evaluate First Term: Evaluate the first term ∑n=3796n. This is an arithmetic series, and the sum of an arithmetic series can be found using the formula S=2n×(a1+an), where n is the number of terms, a1 is the first term, and an is the last term. The first term when n=3 is 6×3=18, and the last term when n=79 is 6×79=474. The number of terms is 79−3+1=77.
Calculate First Term Sum: Calculate the sum of the first term ∑n=3796n using the arithmetic series sum formula.S=277×(18+474)=38.5×492=18954
Evaluate Second Term: Evaluate the second term ∑n=3794. 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 77 in Step 2.
Calculate Second Term Sum: Calculate the sum of the second term ∑n=3794.S=4×77=308
Add Results: Add the results from Step 3 and Step 5 to get the final answer.Total Sum = 18954+308= 19262
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