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22-01-2022
Mathematics

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Determine the sum of the first 20 terms of an arithmetic sequence in which first
terms is 31 and the twentieth term is 109

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22-01-2022

Answer:

1400

Step-by-step explanation:

The average term is the average of the first and last terms.

average term = (31 +109)/2 = 70

The sum of the 20 term is 20 times the value of the average term:

S20 = 20(70) = 1400

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