Q. Find the numerical answer to the summation given below.n=1∑70(3n+10)Answer:
Recognize Split Summations: Recognize that the summation of the series can be split into two separate summations: the summation of 3n from n=1 to 70 and the summation of 10 from n=1 to 70. This can be written as ∑n=170(3n)+∑n=170(10).
Calculate 3n Summation: Calculate the first summation ∑n=170(3n). This is an arithmetic series where each term is 3 times the corresponding term of the sum of the first 70 natural numbers. The sum of the first m natural numbers is given by the formula 2m(m+1). Therefore, the sum of 3n from 1 to 70 is 3×(270(70+1)).
Calculate 3n Sum: Perform the calculation from Step 2. 3×(270(70+1))=3×(270×71)=3×(4970)=14910.
Calculate 10 Summation: Calculate the second summation ∑n=170(10). Since 10 is a constant, the sum is simply 10 added to itself 70 times, which is 10×70.
Calculate 10 Sum: Perform the calculation from Step 4. 10×70=700.
Find Total Sum: Add the results from Step 3 and Step 5 to find the total sum of the series. 14910+700=15610.
More problems from Sum of finite series starts from 1