Question

The zip code of a location consists of five digits chosen from the set Z shown below.
Z = {0, 1, 2, 3, 4, 5, 6, 7, 8, 9}

The set R represents the digits in the zip code for Rubonia.
R = {3, 4, 2, 2, 1}

The set S represents the digits in one of the zip codes for Sarasota.
S = {3, 4, 2, 4, 3}

How many prime numbers are in the set ? ~(rUs)

Answer 1

what does U stand for?

Answer 2

union

Answer 3

i guess is 0 bc ~ mean not but im not sure

Answer 4

and the ~ stands for complement of
\[ \large R\cup S \]
?

Answer 5

yes

Answer 6

so u want to find the complement of
\[ \large R\cup S \]
from Z
just put together R and U (without duplicating elements) and see which elements of Z are missing. that is the complement

Answer 7

ohh ok ill do it

Answer 8

so is 5,6,7,8,9

Answer 9

yes

Answer 10

mmm ok thanks :)

Answer 11

do u have any doubts yet?