r is the set of positive odd integers less than 10 , and s is the set of the squares of the integers in r . how many elements does the intersection of r and s contain ?
squares < 10 { 1 , 4,9 } s = { 1,9 } r = { 1,3 , . . . . . 10 } hence b .
subtract(subtract(10, const_4), const_4)