Question

An individual's phone number contains seven digits, not including the area code, from the set A shown below.
A = {0, 1, 2, 3, 4, 5, 6, 7, 8, 9}

Set B represents the digits in Brent's phone number.
B = {5, 5, 5, 3, 0, 9, 9}

Set C represents the digits in Charlie's phone number.
C = {8, 6, 7, 5, 3, 0, 9}

How many even numbers are in the set ∼(B ∩ C)?

Numerical Answers Expected!

Answer 1

do you know what ∩ means?

Answer 2

union

Answer 3

union is ∪, that one is intersection

Answer 4

oh

Answer 5

so do you know what's intersection?

Answer 6

no

Answer 7

B intersection C gives set which contains those elements which are in both sets B and C so what would be B ∩ C?

Answer 8

intersection

Answer 9

if we had Z={1,2,3,4} and Y={3,4,5}
intersection of Z and Y would be {3,4} because
1 is only in Z
2 is only in Z
3 is in Z and Y
4 is in Z and Y
5 is only in Y
so only 3 and 4 are in both sets

Answer 10

oh

Answer 11

do whats intersection of B and C?

Answer 12

also set H={1,1,1,1,2,2,2,1,1,2,2,2} is exactly same set as H={1,2} because if same thing repeats it doesn't matter

Answer 13

ok

Answer 14

so what is it