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12-7.
  1. Write a formula for the nth term of each of the following series. Homework Help ✎

    1. 3 + 10 + 17 + …

    2. 20 + 11 + 2 + …

The terms are increasing by 7 each time.

t(1) = 3

t(n) = 7n − 4

What is added to each term to get the next?

What is the first term?