Write formal descriptions of the following sets. (a) The set containing the numbers 1, 10, and 100
(b) The set containing all integers that are greater than 10
(c) The set containing all natural numbers that are less than 10
(d) The set containing nothing at all
(e) The set containing the empty string
(f) The set containing the string abc

Which of the following statements is false? a. a class can directly inherit from class object. b. if the class you're inheriting from declares instance variables as private, the inherited class can access those instance variables directly. c. a class's instance variables are normally declared private to enforce good software engineering. d. it's often much more efficient to create a class by inheriting from a similar class than to create the class by writing every line of code the new class requires.