3 years ago

Find the sum of the first 30 terms of the sequence below. An=4n+1

Mathematics

1 answer:

Andre45 [30]3 years ago

4 0

Answer:

1890

Step-by-step explanation:

The sum of the terms of this arithmetic sequence is the product of the number of terms and the average of the first and last term.

A1 = 4·1 + 1 = 6

A30 = 4·30 + 1 = 121

The average term in the sequence of 30 terms is (6 + 121)/2 = 63, so the sum of the sequence is ...

30·63 = 1890

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