home > 1.5: Cartesian products string gives back X: X = x. Strings are used to specify passwords for computers or online acco allowed or required in a valid password. Strings also play an importa the cardinality of sets PARTICIPATION ACTIVITY 1.5.6: String basics. 1) What is the length of string Zzyzx? 5 Check Show answer 2) Let X = (X. y, z). Is the string Zzyzx an element in X? Check Show answer 3) Define the strings s = 1101 and t = 001 What is st? Check Show answer 4) Define the string t=001. What is t1? Check Show answer 5) Define the string t=001. What is t^? Check Show