Find the sum of the first 20 terms of the arithmetic sequence whose first term is 3, and the 20th term is 83.
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Find the sum of the first 20 terms of the arithmetic sequence whose first term is 3, and the 20th term is 83.
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Answer:
1290
Step-by-step explanation:
Given:
n = 20
A1 = 3
An = 83
Formula:
Substitute and calculate.
The answer is 860.