1 answer

(click or scroll down)

## To find the number of people who belong to both clubs, you can use a method called the intersection of sets. We know that Club R has 11 members and Club T has 16 members. Let's represent the membership of each club as sets:

Let set R represent the members in Club R. |R| = 11

Let set T represent the members in Club T. |T| = 16

To find the intersection, we need to find the common members between the two sets. Mathematically, this can be represented as:

|R âˆ© T| = |R| + |T| - |R U T|

Where |R âˆ© T| represents the size of the intersection of sets R and T, and |R U T| represents the size of the union of sets R and T.

Given that a total of 20 people belong to the two clubs, we can substitute the values into the formula:

|R âˆ© T| = 11 + 16 - 20

Simplifying further:

|R âˆ© T| = 27 - 20

|R âˆ© T| = 7

Therefore, there are 7 people who belong to both Club R and Club T.