Use the set builder notation to represent the following sets. If necessary, feel free to use English sentences for predicates.

(a) S= {4, 5, 6, 8, 9, 10, 11, 12, 13, 14, 15, 16}

(b) S= {5, 10, 15, 20, 25, 30, 35, 40, } *This is an infinite set*

(c) S= {3, 33, 333, 3333, 33333, 333333, } *This is an infinite set*