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To find the first 5 terms, plug 1, 2, 3, 4 and 5 in for n:

3*1-3 = 0

3*2-3 = 3

3*3-3 = 6

3*4-3 = 9

3*5-3 = 12

The first five terms are 0, 3, 6, 9 and 12.

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2n - 1

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1 7 13 19

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Q: What are the first 5 terms in the sequence 3n-3?
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What is the sum of first six terms of a sequence whose nth term is 8 - n?

nth term is 8 - n. an = 8 - n, so the sequence is {7, 6, 5, 4, 3, 2,...} (this is a decreasing sequence since the successor term is smaller than the nth term). So, the sum of first six terms of the sequence is 27.


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