Find the First and Third Partial Sums, S1 and S3 $$a _ { n } = 3 n + 9$$

question 206

Multiple Choice

Find the first and third partial sums, s1 and s3, for the sequence
- $$a _ { n } = 3 n + 9$$

• A)12, 45
• B)12, 18
• C)12, 36
• D)12, 42

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