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ਕਦਮ ਦਰ ਕਦਮ

1. \sum_{n=1}^{\infty} \frac{1}{n}

   Does this series converge?

2. \lim_{n\to\infty} \frac{1}{n} = 0

   Divergence test: if the terms do not go to 0 the series cannot converge.

3. \lim \left|\frac{a_{k+1}}{a_k}\right| = \lim \left|{\frac{n}{n + 1}}\right| = 1

   Ratio test: < 1 converges, > 1 diverges, = 1 says nothing.

4. \text{diverges}

   The series diverges.