Question

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

The set M represents the digits in one of the zip codes for Miami.
M = {3, 3, 1, 9, 0}

The set C represents the digits in one of the zip codes for Cooper City.
C = {3, 3, 3, 3, 0}

How many prime numbers are in the set ? M u C

Answer 1

We are not supposed to list duplicates in a set, for example,
M={3,1,9,0}
C={3,0}
So M union C = {3,1,9,0}
with duplicates removed.
How many prime numbers are there (1 is neither prime nor composite)

Answer 2

4

Answer 3

Zero is not a prime. One is neither prime nor composite. Nine is a composite.
So how many primes are left in \(M \cup C\) ?

Answer 4

@mathmate

Answer 5

Yes, do you have a question?

Answer 6

i have the same question....so there is only one prime #

Answer 7

Yes, that is correct.
Which one is it?

Answer 8

3

Answer 9

Correct.
Is everything clear to you, or you could use some more explanation?

Answer 10

every thing is clear thanks a lot :)

Answer 11

You're very welcome! :)