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

I think the answer is (3,9)

Answer 2

is that right?

Answer 3

It doesn't say what prime numbers...it says HOW MANY prime numbers....and 9 is not a prime number, but 3 is...so there are 6 prime numbers....the thing that I don't understand is why is there a U in the middle of M and C?

Answer 4

it is the union of the 2 sets

Answer 5

idk how to do a union sign, so I used a u lol

Answer 6

oh ok that makes more sense

Answer 7

just clarifying, the answer would be 6?

Answer 8

I believe so...because there are 6 prime numbers total in group M and C

Answer 9

okay :)

Answer 10

:) I'm always here to help

Answer 11

thank you

Answer 12

you are very welcome

Answer 13

:)

Answer 14

btw what does the squiggle mean again?

Answer 15

~(M U C)
^this one...

Answer 16

That just shows that M U C is where you are supposed to be looking for the prime numbers

Answer 17

ohh okay, thanks :)

Answer 18

again, you are very welcome :)

Answer 19

thomasj e mailed me saying that he thinks the squiggle means everything not in the set, he answer is this : my best guess is that it's (2,5,7)

Answer 20

I just want to be sure I have the right answer

Answer 21

hmmm well that makes things a bit tougher.....I'm not sure....but I'll message thomasj and see how he knows that

Answer 22

okay :) let me know what u find out :)