Question

CHECK MY ANSWER PLEASE.
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 complement of M union C?
the answer is 3?

Answer 1

C contains 0, 1, 3 & 9. M contains 0 & 3.

M union C is just M, in terms of the numbers it contains.

the primes in D are 2, 3, 5 & 7.

Since M union C only contains 3 (in terms of primes) than means the complement will contain 2, 5 & 7.

Answer 2

ohh so the answer is 2 5 7?

Answer 3

yup