Question

Suppose R = {1, 3, 5, 7, 9, 11, 13, 15, 17} and D = {3, 6, 9, 12, 15, 18, 21, 24, 27}. What is R ∩ D? (

Answer 1

`R\cap D=\{3,9,15\}`

Answer 2

The elements in both sets is written as

`R\cap D=`
`3,9,15`

Step-by-step explanation

The first set is

R={
`1,2,3,5,7,9,11,13,15,17`}.

The second equation is

`D=`{
`3,6,9,12,15,18,21,24,18,27`}.

The intersection of the two sets denoted by
`R\cap D` are the elements that are found in set R that are also in set D.

These elements are 3,9 and 15.

So we write

`R\cap D=`
`3,9,15`

Note that when there is no element in common to both sets, then the intersection is the null set, {
`\emptyset`}.