[Q2] Informatics Concepts

Let Q_s be the set containing all the subsequences of string S and T_s be the set of all the substrings of string S. It is correct to say that:

1. Q_s ⊆ T_s
2. T_s ⊆ Q_s
3. Q_s ⊂ T_s
4. T_s ⊂ Q_s
5. None of the above

Original idea by: Juan Felipe Hernández Albarracín.