Mathematics · Infinite Series
Let ∑ an be an infinite series with an > 0. Which of the following statements is FALSE?
- 1If ∑ an is convergent and bn = (a1 + a2 + ... + an)/n for all n ∈ &mathbb{N}, then ∑ bn is always convergent.✓
- 2If ∑ an is convergent, then ∑ an2 is always convergent.
- 3If ∑ an is convergent, then ∑ √(an · an+1) is always convergent.
- 4If ∑ an is convergent, then ∑ √an may not be convergent.
Correct answer
If ∑ an is convergent and bn = (a1 + a2 + ... + an)/n for all n ∈ &mathbb{N}, then ∑ bn is always convergent.
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