6.8.15 Set Theory

Condition: given the sequence of sets \ (a_ {n} = [0; 1 / n], n = 1.2, \ ldots \) Find \ [\ Bigcup_ {N = 1}^{\ Infty} A_ {N} \ TeXT {and} \ bigcap_ {n = 1}^{\ infty} a_ {n}. \]