Question

C={0,1,3,5,7},D={1,2,4,6,7}} intersection in them??​

Answer 1

the answer isC n D= {1,7}

Answer 2

The intersection in them is {1, 7}

Explanation:

Let us revise some definition in the operation of sets of numbers

• The intersection of two sets of numbers is the set of all elements belong to both sets
• The union of two sets of numbers is the set of all elements belong to one of the two sets (without repetition)

→ Ex: set A = {1, 2, 3, 5, 6} and set B = {4, 5}, then

• A ∩ B = {5} ⇒ ∩ is the symbole of intersection
• A ∪ B = {1, 2, 3, 4, 5, 6} ⇒ ∪ is the symbole of union

Let us solve the problem

∵ C = {0, 1, 3, 5, 7} , D = {1, 2, 4, 6, 7}

→ The common elements in the two sets are 1 and 7

∴ C ∩ D = {1, 7}

∴ The intersection in them is {1, 7}