Exercise 21 Page 218

First, we will write D in roster form. D={ 1, 3, 5, 7, 9} An intersection of two sets is the set that contains elements that are common in both sets. An element is in the intersection of C and D if it belongs to C and to D at the same time. C&={ 2, 5, 7, 10} D&={ 1, 3, 5, 7, 9} C ⋂ D&={ 5, 7}