If A = {positive integers} and B = {…,−4, −3, −2, −1} what is A ∩ B?
{ }

{…, −3, −2, −1, 1, 2, 3, …}

{1, 2, 3, 4, …}

{…−3, −2, −1}

Question

If A = {positive integers} and B = {…,−4, −3, −2, −1} what is A ∩ B?
{ }

 {…, −3, −2, −1, 1, 2, 3, …}

 {1, 2, 3, 4, …}

 {…−3, −2, −1}

anonymous · Answer

Please and thank you :)

anonymous · Answer

$A \cap B$ is the set of elements in both $A$ and $B$. Since $A$ only contains positive integers and $B$ only contains negative integers, and a number cannot be both positive and negative, $A\cup B$ is the empty set {}.

anonymous · Answer

That's what i thought, Thanks sooo much! :)

anonymous · Answer

(Sorry - typo on the last line.)

You're welcome!

anonymous · Answer

it is a null set

anonymous · Answer

Thank you!:)