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10-54.
  1. Write each series in sigma notation and calculate the sum or an expression for the sum. Homework Help ✎

    1. 47 + 34 + 21 + …+ (–83)

    2. 3 + 10 + 17 + … + (7n – 4)

What is the expression for the sequence?

How many terms are there in the series?

One possible answer:

Instead of going up to a specific term, this series sums up the first n terms of the sequence given in parentheses.