please explain them step by step carefully paper with pen...because it's hard to understand keyboard typed solutions...Thank you

PREVIOUS ANSWERS LA Determine the convergence or divergence of the series. arctan(n) n=1 O converges O diverges Need Help? Watch It Submit AnswerConsider the following repeating decimal. 0.3 Exercise (a) Write the repeating decimal as a geometric series. Click here to begin! Exercise (b) Write its sum as the ratio of two integers. Click here to begin! Check ScoreCheck Score Show Answer Hide Solution Find the sum of the convergent series. 6 + 3+ 3 + 3 + 2 4 12 Submit Answer 6. [12.5/12.5 Points] DETAILS PREVIOUS