What is the sum of the first 21 terms of the series 1 + 4 + 7 + 10 + 13 + 16 …?Select one:a. 642b. 645c. 648d. 651
Question
Solution 1
The given series is an arithmetic series where the common difference (d) is 3 (4-1, 7-4, 10-7, etc.).
The sum (S) of the first n terms of an arithmetic series can be calculated using the formula:
S = n/2 * (2a + (n-1)d)
where:
- n is the number of terms,
- a is the first term, and
- d is the c Knowee AI StudyGPT is a powerful AI-powered study tool designed to help you to solve study prob
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