What are the most common mistakes students make in Sequences & Series?
the sum a/(1−r) exists only when |r|<1; otherwise the series diverges.
Top mistakes to avoid in Sequences & Series: • the sum a/(1−r) exists only when |r|<1; otherwise the series diverges. • using the wrong count (n vs n−1) for the nth term. • adding the ratio instead of multiplying by it. • applying the sum formula when |r| ≥ 1.
Common mistake
the sum a/(1−r) exists only when |r|<1; otherwise the series diverges.
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