Chapter 11 - Section 11.1 - Sequences - Exercise Set - Page 640: 55

multiple answers; see details

Given that $ a_n=\dfrac{1}{\sqrt{n}} $, then, \begin{array}{l} a_1=\dfrac{1}{\sqrt{1}} =1 ,\\\\ a_2=\dfrac{1}{\sqrt{2}} \approx 0.7071 ,\\\\ a_3=\dfrac{1}{\sqrt{3}} \approx 0.5774 ,\\\\ a_4=\dfrac{1}{\sqrt{4}} \approx 0.5 ,\\\\ a_5=\dfrac{1}{\sqrt{5}} \approx 0.4472 .\end{array}