The sum of the first 10 terms of arithmetic sequence is 530.what is the first term if the last term is 80 and the common difference is 2?
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Answer:
Given
d = 2
l = 80
n = 10
S10 = 530
To find a.
Step-by-step explanation:
S10 = 530
10/2(a + 80) = 530
5(a + 80) =530
a + 80 = 530/5
a = 106 - 80
First term = 26
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