Q. Find the numerical answer to the summation given below.n=0∑69(2n+9)Answer:
Find First Term: We need to find the sum of the arithmetic series where the nth term is given by the formula (2n+9). The series starts at n=0 and ends at n=69.
Find Last Term: First, let's find the first term of the series when n=0. Plugging in n=0 into the formula (2n+9) gives us the first term a1=2(0)+9=9.
Calculate Sum Formula: Next, let's find the last term of the series when n=69. Plugging in n=69 into the formula (2n+9) gives us the last term a70=2(69)+9=138+9=147.
Plug in Values: The sum of an arithmetic series can be found using the formula Sn=2n∗(a1+an), where n is the number of terms, a1 is the first term, and an is the last term. Since we start at n=0 and go to n=69, there are 70 terms in total.
Calculate Sum: Now we can plug the values into the sum formula: S70=270×(9+147)=35×156.
Calculate Sum: Now we can plug the values into the sum formula: S70=270×(9+147)=35×156. Calculating the sum gives us S70=35×156=5460.
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