Find the sum of the first 10 terms of the arithmetic sequence: 5, 9, 13, 17, ...
Question
Find the sum of the first 10 terms of the arithmetic sequence: 5, 9, 13, 17, ...
Solution
To find the sum of the first 10 terms of an arithmetic sequence, we can use the formula for the sum of an arithmetic series:
S_n = n/2 * (a_1 + a_n)
where: S_n is the sum of the first n terms, n is the number of terms, a_1 is the first term, and a_n is the nth term.
In this case, n = 10, a_1 = 5, and we need to find a_10.
The nth term of an arithmetic sequence can be found using the formula:
a_n = a_1 + (n - 1) * d
where d is the common difference. In this case, d = 9 - 5 = 4.
So, a_10 = 5 + (10 - 1) * 4 = 5 + 36 = 41.
Now we can find S_10:
S_10 = 10/2 * (5 + 41) = 5 * 46 = 230.
So, the sum of the first 10 terms of the arithmetic sequence is 230.
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