Q. Find the numerical answer to the summation given below.n=2∑66(7n+6)Answer:
Breakdown Summation: Recognize that the summation of a linear expression can be broken down into the summation of its individual terms. We can separate the given summation into two separate summations: one for the 7n term and one for the constant term 6. So, we rewrite the summation as: ∑n=266(7n)+∑n=266(6)
Evaluate First Term: Evaluate the first term ∑n=266(7n) using the summation rule for arithmetic series. The sum of an arithmetic series can be found using the formula:n=a∑b(dn)=d⋅(2b(b+1)−2a(a−1))where d is the common difference, a is the first term, and b is the last term.In our case, d=7, a=2, and b=66.n=2∑66(7n)=7⋅(266(66+1)−22(2−1))
Calculate First Term: Calculate the first term ∑n=266(7n) using the formula from Step 2.∑n=266(7n)=7×(266×67−22×1)=7×(2211−1)=7×2210=15470
Evaluate Second Term: Evaluate the second term ∑n=266(6) using the summation rule for a constant. The sum of a constant k from n=a to n=b is simply k(b−a+1).∑n=266(6)=6×(66−2+1)=6×65
Calculate Second Term: Calculate the second term ∑n=266(6) using the calculation from Step 4.∑n=266(6)=6×65=390
Find Total Sum: Add the results from Step 3 and Step 5 to find the total sum of the series.Total sum = 15470+390= 15860
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