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)?

Answer 1

I put 1, but apparently that was wrong. :(

Answer 2

Usually the Intersection symbol means what elements are common to both sets.
So if
G = {A, B, C, D}
and
H = {C, D, X, Z}
then
\[G\cap H = \{C, D\}\]

Answer 3

Ok...so then what is the above question I posted?

Answer 4

Well, what Numbers are in-BOTH-

B = {5, 5, 5, 3, 0, 9, 9}
C = {8, 6, 7, 5, 3, 0, 9}
?

Answer 5

0, 5, 9,3? But I do not get the even answers? Would it be none?

Answer 6

Well, 0 is technically even, but no you don't get the even answers because they are not in set B. That is what intersection means. What elements do both sets -intersect- at.
Your {0, 5, 9,3} should be the right answer.

Answer 7

So 4?

Answer 8

no it should be 1 unless they don't count 0 as an even and then it should be zero even answers.

Answer 9

Yeah, I put 1 and I got it wrong, so 0?

Answer 10

That's what I would put.

Answer 11

*UNLESS* that ~ sign means complement in the text you've been taught. But I've never seen it that way.

Answer 12

I know right! Oh well, I put 0, I will find out tomorrow, if it is right. :)

Answer 13

byeee, have to go now!!!