prove the convergence of the series and find the sum.
please help me
What series tests do you know?
i don't understand your question /
What theorems or results do you know that allow you to (dis)prove convergence?
For example, you have the ratio test. Or you have the divergence test that allow you to show convergence if the terms of the series do not converge to ##0##.
So, which of these tests do you know?
sign Leibniz , Dalambers
OK, so try those tests. Are there any that work?
that's it I can not decide =) wanted to ask for help, but sorry no one answers.
Pick some test that you know, and try it! If it doesn't work, try another one.
Let's start with the first one you mentioned: the sign test, what does that say? Does this series satisfy the criteria?
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