Write the appropriate representation of the following sets :
1. All the months of the year that start with Letter J
2. All the natural even numbers less than 20
B. Represent each set using roster method and set - builder notation.
1. All the colors of the Philippine flag
2. All past presidents of the Philippines
C. Find the cardinality of B = {Number of senses}
D. Write the possible subsets of A = {a,b,c,d,e}