For a set K = {0} U {1/n | n in N (natural number} U [1, 2)

Last updated: 7/15/2022

For a set K = {0} U {1/n | n in N (natural number} U [1, 2) with R subspace topology. The following sets are open, closed, or neither in set K? 1. {1/n | n in N} 2. {1/n} for n in N 3. {1/n | k >= 2}