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3-67.

Consider the sequence      Homework Help ✎

  1. Find the value of if the sequence is arithmetic.

    Figure out what the third term should be based on the first two terms.
    Then use the result to figure out the value of .

    The third term should be .

  2. Find the value of if the sequence is geometric.

    Refer to part (a) for the solution strategy, but this time find assuming the sequence is geometric.