Question

Помогите пожалуйста!

Answer 1

$x_{n} = frac{ sqrt{n}-1 }{2n} \ \ x_{1} = frac{ sqrt{1}-1 }{2*1} =0 \ \ x_{2} = frac{ sqrt{2}-1 }{4} \ \ x_{3} = frac{ sqrt{3}-1 }{6} \ \ x_{4} = frac{ sqrt{4}-1 }{2*4} = frac{1}{8}$